Franklin CDU-550 EV-DO USB Modem: Mobile Broadband Before Wi-Fi Hotspots

Long before a phone could double as a Wi-Fi hotspot, getting a laptop online away from your desk meant hunting for a hotspot worth using, tethering an EV-DO phone with a cable, or sliding a PC Card modem into a slot your machine might not have. The Franklin Wireless CDU-550 solved that last problem directly: a USB stick that plugged into whatever port a laptop already had and dialed into a CDMA EV-DO network. Mobility Today covered it within days of its first sighting, in an August 2006 post titled “First Look: Franklin Wireless USB EVDO Card” — coverage that would later resurface, years apart, in a Mac forum thread about laptop expansion ports and in gadget-blog roundups of USB modems.

What Was the Franklin CDU-550?

The CDU-550 was a USB modem built around CDMA 1xEV-DO, made by Franklin Wireless — a San Diego company marketing hardware manufactured by C-Motech, a Korean electronics maker, per FCC filings. Mobility Today’s original write-up never actually used the model number, calling it simply the “Franklin Wireless USB EVDO Card.” The name CDU-550 shows up in a reader comment on that same article weeks later, and in other outlets’ coverage — enough to confirm the identification.

Getting Online Before Wi-Fi Was Everywhere

In 2006, Wi-Fi hotspots existed but weren’t reliable travel companions — coverage was patchy, plenty charged for access, and airports and hotels ran their own clunky paid portals. Smartphones couldn’t act as personal hotspots yet, and tethering a phone meant a cable, a driver install, and a data plan that might not even allow it. Cellular data cards were the alternative for anyone who needed a connection wherever they happened to be, not just wherever a hotspot existed.

Why USB Was the Real Innovation

The CDU-550’s real pitch wasn’t EV-DO itself — plenty of PC Card modems already did that — it was the connector. USB ports were close to universal in a way PC Card and ExpressCard slots never were. Mobility Today’s own framing made this the headline: it would “enable Tablet PC and Mac laptop and desktop users that do not have a PCMCIA card slot to connect to the Internet.” That’s the reason it mattered — removing a hardware requirement that had locked machines out of mobile broadband.

The MacBook Connection

The Mobility Today URL later resurfaced in a January 2007 Gearspace thread, “book vs book pro: fw 800 who cares?” — a debate over whether a musician needed a MacBook Pro or a plain MacBook would do. One poster, addressing the base MacBook’s lack of an ExpressCard/34 slot, wrote it wasn’t a dealbreaker because “there are USB mobile broadband solutions coming out,” linking directly to the Mobility Today article — the CDU-550 cited as a workaround for exactly this expansion-slot gap.

Did It Actually Work on a Mac?

Worth being direct: the Gearspace poster wasn’t vouching for driver-level Mac support, just citing USB broadband as a category. Separately, Mac compatibility checks out: Franklin’s October 2006 release states the CDU-550 “is also supported on Intel based Macintosh systems running the latest update of Mac OS X v.10.4.7,” and a May 2007 Mexico-market review independently lists the same OS version with included drivers. Support was real and documented — not something to infer from the Gearspace link alone.

UMPCs Needed Exactly This

Mobility Today filed its coverage under the site’s UMPC news section, and reader comments identify the device in the accompanying photos as a Sony VAIO UX — one of the compact ultra-mobile PCs of the period, alongside machines like the Samsung Q1 and OQO’s Model 01/02, which typically shipped without a card slot at all. For that category, a USB EV-DO modem was close to the only mobile broadband option available.

What Is EV-DO, Exactly?

EV-DO stands for Evolution-Data Optimized, a mobile data standard built on top of CDMA cellular networks. It let subscribers browse the web, check email, download files, and reach corporate networks over a cellular connection instead of Wi-Fi — the same basic promise every mobile data standard since has made, just at mid-2000s speeds and prices.

EV-DO Rev. 0, Not Rev. A

The CDU-550 was built for EV-DO Rev. 0, the first commercial version of the standard, not the later Rev. A revision that improved uploads and latency. Rev. 0’s theoretical peak downstream speed was around 2.4 Mbps — a ceiling, not a typical result. Real-world speeds varied with signal, congestion, carrier configuration, and location, and were commonly well below that maximum.

Faster Than Dial-Up, By a Lot

Even accounting for real-world shortfalls, EV-DO Rev. 0 was a dramatic upgrade over dial-up, which topped out at a theoretical 56 Kbps. Even a connection running at a fraction of EV-DO’s peak still comfortably outran a phone-line modem — a big part of why cellular data cards found a market among people who’d had no broadband option at all while traveling.

EV-DO vs Wi-Fi

Neither technology made the other obsolete — they solved different problems.

Plenty of road warriors used both — Wi-Fi where a good hotspot existed, EV-DO everywhere else.

Sprint, and Beyond Sprint

In the US, the CDU-550 ran on Sprint’s Power Vision Network — Mobility Today’s article says so directly, describing coverage of “153 million people” across “220 major metropolitan areas” and “470 airports.” Franklin didn’t stop there: a December 2006 release announced Iusacell, a Mexican carrier, had selected the CDU-550, and a May 2007 review confirms it sold there under Iusacell’s “BAM” branding..

Getting Connected, Back Then

Framed strictly as history, not instructions for reviving a retired network: getting online meant installing drivers and a carrier-provided connection manager, plugging the modem into a USB port, and letting the connection manager handle authentication and session setup with the carrier’s EV-DO network. One reader on the original post noted “Sprint wrote the connection manager for Franklin,” looking nearly identical to software bundled with a competing Novatel PC Card modem.

No Battery, No AC Adapter

Drawing power directly from the USB port meant no separate battery and no AC adapter to carry — a real convenience next to PC Card modems that needed their own power management. The tradeoff: it drew from the laptop’s own battery, so a modem left connected all day was a modest but real drain on runtime.

A Thumb Drive That Wouldn't Quit

Contemporary coverage described the CDU-550 as a “chunky thumb-drive sized gizmo” that plugged straight into USB with no cable, unlike some competitors that used a short tether. That direct connection was compact but not risk-free — one early write-up warned “a slight bump would probably rip the card right out of the USB socket.” Exact dimensions aren’t confirmed here; what’s consistent is the general shape and the protrusion-prone design it implied.

The Antenna Question

The CDU-550 had a visible external antenna rather than a fully internal one, and accounts of it are genuinely mixed. One early commenter worried it looked “kinda delicate” and “easy to break,” and a separate write-up from the same week independently called it “delicate-looking.” A different reader pushed back weeks later, writing that “the antenna has had zero problems whatsoever” and was “very solid.” Both impressions are on the record; this piece isn’t picking a side.

A Tool for the Road Warrior

For business travelers, a modem like this meant checking corporate email, connecting to a VPN, pulling up a CRM, or doing web research from a hotel room or airport gate — without depending on whatever Wi-Fi happened to be available, and without paying per-session hotspot fees on top of a data plan already being paid for.

Windows Support

Windows XP support is confirmed by a May 2007 review, which also notes a Windows Vista-compatible software version had become available by then — Vista having launched that January. This article isn’t confirming Windows 2000 support either way; it simply wasn’t documented in the sources checked here.

Pocket PCs Get an Upgrade

In October 2006, Franklin announced the CDU-550 now supported Windows Mobile, calling it “the most prevalent OS running on most PDAs and Ultra-Mobile PCs” in its own release. That mattered for anyone hoping to use it with a Pocket PC or early UMPC — though the host device needed genuine USB host capability, which not every PDA of the era actually had. Support for Windows Mobile didn’t mean support for every handheld Franklin’s marketing implied.

The Linux Surprise

The same October 2006 announcement confirmed Linux support, and Franklin president O.C. Kim was explicit about how unusual that was: “There are many cards available, but only the Franklin Wireless CDU-550 is multi-platform... it is the only USB mobile broadband product that supports the Linux system.” This was Franklin’s own official claim, not a third-party workaround — notable when mobile broadband drivers were overwhelmingly Windows-first.

PC Card, ExpressCard, or USB?

Each connector had a real tradeoff, not just a compatibility difference.

Dedicated Modem vs Phone-as-Modem

Tethering a phone for data was already possible in 2006, but it meant a cable, extra software, and — depending on the carrier — a separate charge some enforced and others didn’t. A dedicated modem sidestepped all of that: its own data plan, no drain on the phone’s battery, no dependence on the phone being present. The tradeoff was carrying, and paying for, a second device.

What It Cost to Stay Connected

US retail pricing for the CDU-550 isn’t confirmed in the sources checked here, and this article isn’t inventing a number. What is documented is a Mexican price point from Iusacell’s May 2007 offering: 3,220 pesos including tax, bundled with one month of free service — a useful data point for the general shape of EV-DO-era pricing, even if it doesn’t tell us what Sprint charged in the US.

What the Record Actually Shows

Mobility Today’s original piece says only that “our early tests have shown remarkable speeds” — no number attached in the archived copy recoverable today. A separate gadget-blog roundup from the same week claimed Mobility Today’s testing showed “up to 525kbps downstream on a given file,” but that figure doesn’t appear in any archived version of the page checked here. Rather than repeat a secondhand paraphrase as fact, this piece flags the discrepancy and falls back on the general Rev. 0 envelope above: real, but well below the 2.4 Mbps ceiling.

The Latency Nobody Talked About

Cellular data has always carried more latency than a wired connection, and Rev. 0 was no exception — a real consideration for remote desktop sessions or voice calls, even when raw throughput looked adequate. No specific latency figures for the CDU-550 were found, and none are invented here.

Cellular Wasn't Automatically Secure

Worth stating plainly: using cellular instead of a public hotspot didn’t mean traffic was automatically safe. HTTPS, VPN use for sensitive access, and basic endpoint security still mattered on an EV-DO connection exactly as on any other network — cellular reduced certain open-Wi-Fi risks, but wasn’t a substitute for those protections.

Who Made This Thing?

Franklin Wireless was a San Diego company, traded over the counter as FKLT, that developed and marketed wireless broadband devices — USB modems chief among them, mobile hotspots coming later. Its materials describe distribution through OEMs, distributors, and carrier relationships across the Americas and the Caribbean. The hardware, per FCC filings, was manufactured by C-Motech, a Korean company; a reader on the original thread noted C-Motech had put roughly a million dollars into Franklin around the same period.

A Nod From the Press

A tech write-up from the period — traceable to a review originally published on TabletPC2.com and later preserved through syndication — gave the CDU-550 a “Product of the Month”-style nod, praising constant cellular access over GPRS or dial-up while still calling the hardware “a little bulky.” This article isn’t fabricating a fuller quote or an exact date it can’t confirm.

EV-DO Rev. A Came Next

EV-DO Rev. A followed as a distinct, later standard with better upload speeds and lower latency. The CDU-550 was a Rev. 0 device; Franklin’s follow-up hardware, like the CDU-680, was built for Rev. A instead. The CDU-550 itself never gained Rev. A capability.

Franklin's Later U-Series

Franklin’s line moved well beyond the CDU-550, eventually including U-series modems like the U210, adding Rev. A support, GPS, and microSD expansion the CDU-550 never had. Those later modems belong to a different generation and shouldn’t be read back onto the CDU-550’s spec sheet.

From USB Dongles to MiFi

Standalone USB modems eventually gave way to pocket-sized MiFi devices, which did the same cellular-to-data job but broadcast a small personal Wi-Fi network instead of tying up one USB port on one machine — letting several devices share a connection at once.

Then Your Phone Became the Modem

As smartphones matured, built-in hotspot and tethering features made a dedicated modem unnecessary for a growing share of users — the phone already in someone’s pocket could now do the job a separate USB stick used to handle.

EV-DO's Long Goodbye

From there, the industry moved through LTE and on to 5G, each generation folding faster mobile data more directly into phones, laptops, and tablets. US carriers have since shut down their CDMA and EV-DO networks entirely, meaning a device like the original CDU-550 can no longer function as a working broadband modem on any current US network.

Could You Use One Today?

Practically, no — not as a working connection. The networks it depended on are retired, period drivers may not run cleanly on current operating systems, and no carrier can activate service for hardware this old even if it still powers on. Its value today is historical and collectible, not functional.

Notes for Collectors

For anyone tracking down a surviving unit: the modem and antenna intact, original packaging, the driver CD, printed carrier documentation, and — if you’re lucky — the USB extension cable Franklin bundled with at least some regional releases, since loose accessories like that tend to disappear first.

FAQ

What was the Franklin CDU-550?

A USB modem from Franklin Wireless, built on hardware from Korean manufacturer C-Motech, connecting computers to CDMA EV-DO networks starting around 2006.

What did it do?

Gave a computer mobile broadband access — browsing, email, downloads, VPN access — over cellular instead of Wi-Fi, via USB.

What is EV-DO?

Evolution-Data Optimized, a mobile data standard built on CDMA cellular networks, designed to carry internet traffic rather than just voice calls.

Did it support EV-DO Rev. 0?

Yes. The CDU-550 was built for Rev. 0, the first commercial version of the standard — not the later Rev. A.

How fast was EV-DO?

Rev. 0 had a theoretical peak downstream speed of around 2.4 Mbps, but real-world speeds were typically well below that.

Was it faster than dial-up?

Yes, considerably — dial-up topped out at a theoretical 56 Kbps.

Could it work without Wi-Fi?

Yes — that was the point. It connected over the cellular network, so it worked anywhere the carrier had EV-DO coverage.

Did it use USB, and work with laptops?

Yes to both — it connected to any laptop’s USB port directly, with no PC Card or ExpressCard slot required.

Did it work with UMPCs?

Yes — one of its core use cases. UMPCs like the Samsung Q1, Sony VAIO UX, and OQO models commonly lacked card slots entirely.

Did it support Windows Mobile?

Yes, as of an October 2006 announcement, though the host device needed proper USB host capability.

Did it support Linux?

Yes, per the same announcement — Franklin claimed it was the only USB mobile broadband product supporting Linux at the time.

Did it work with Mac OS X?

Yes. Franklin confirmed support for Intel-based Macs on OS X 10.4.7 or later, independently corroborated by a contemporary regional review.

Which carrier used it?

Sprint sold it in the US on its Power Vision Network. Franklin also supplied it to Iusacell in Mexico starting in late 2006.

Did it require a data plan, and how did it compare to a PC Card modem?

Yes, it needed an active carrier plan and activation like any cellular modem. Compared to a PC Card, which sat flush in a slot many laptops lacked, it traded that fit for near-universal USB compatibility.

Can a CDU-550 be used today?

Not as a working connection — the CDMA/EV-DO networks it relied on are shut down in the US, so a surviving unit has collector value only.

What replaced USB EV-DO modems?

Pocket-sized MiFi hotspots came next, followed by built-in smartphone tethering, and eventually LTE and 5G built directly into laptops and tablets.