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Regardless of how you might feel about the  potential  dangers of electromagnetic radiation, it came in mighty handy today -- identifying this brand-new Sony S2 tablet headed to the USA. The FCC recently got a glimpse at Sir Howard's dual-screen Honeycomb clamshell, and thanks to the public portion of their reports, we've got some crucial specs: the Sony "SGPT211US" will sport 2.4GHz 802.11 b/g/n WiFi, Bluetooth, and most tellingly, 850MHz and 1900MHz 3G bands suggesting a launch on AT&T. Now, those frequencies are certainly also used by several prominent Canadian carriers, but it just so happens that this particular model tested is a US variant -- with others designated for Canada and Japan -- and this particular cellular module is the Ericsson F5521gw, which means we could even be looking at 21Mbps HSPA+ speeds. Before you start speculating, however, there's one more crucial spec to share: the prototypes apparently have a removable 3080mAh lithium-ion bat...

AT&T has been adding a little dash (and asterisk) of 4G to all its phones as of late, but not all of those handsets are created equal -- the Motorola Atrix 4G, HTC Inspire 4G and HP Veer 4G are technically capable of only HSDPA Category 10, which equates to maximum download speeds of 14.4Mbps. Not so for the new Samsung Infuse 4G, as it's been boosted to HSDPA Category 14, which bumps its particular flavor of 4G up to 21Mbps. That has AT&T playing in the same arena as T-Mobile, assuming that your local cell towers have the fiber backhaul in place... and assuming that T-Mobile doesn't make good on promises to deliver some 42Mbps (HSPA+ Category 20) handsets before AT&T catches up. And yes, the uploads should be fine, too -- AT&T says the Infuse 4G supports HSUPA Category 6, which should give us maximum rates of 5.76Mbps when firing files into the clouds.

We've seen it powered down and had it dangled in front of us and now, four months after its launch, we've finally had a chance to play with a real, working Samsung Infuse 4G. This 4.5-inch superphone -- the biggest Sammy has made to date -- feels surprisingly light in the hands, despite its width. That's largely thanks to its crazy-thin 8.99mm profile, along with a subtly textured backside. The Super AMOLED Plus display -- the same kind found on the smaller Droid Charge -- which promises to be brighter than Super AMOLED as well as easier to view in direct sunlight, is simply stunning. We were seriously impressed by the punchy colors and deep blacks, although that outdoor test will have to wait for another day. Blessedly, Samsung lets those vibrant colors speak for themselves -- it loaded the phone with Android 2.2 and  abstained from saddling it with its TouchWiz UI  made its TouchWiz UI less intrusive out of the box. The handset packs a s...

If you're waiting impatiently for the ability hook your laptop in to T-Mobile's blazingly fast 42Mbps HSPA+ network, you are going to have hold tight just a little bit longer. But here's some good news to tide you over: the 21Mbps capable Rocket 4G USB stick is here, and available starting April 17th with new prepaid data plans for those who prefer not to chain themselves to a two-year contract. The $30, 30-day plan will jump from 300MB to 1GB, and the $50 plan will be bumped from 1GB to 3GB. It's not as flashy as the 4G Mobile Hotspot nor as fast as the 42Mbps Rocket 3.0, but it's priced at a reasonable $59.99 -- and controlling the destiny of your mobile broadband soul must be worth something. Phone Arena @TMobile (Twitter)

Don't ya just love it when a plan comes together? As expected, T-Mobile has confirmed that its 4G Mobile Hotspot will be hitting stores tomorrow. The ZTE-sourced sliver of plastic and OLED will be T-Mo's first such device and, with its HSPA+ radio, clocks in at 21Mbps, while an SD card slot means it can provide up to 32GB of wireless storage. You can read more about it from our hands-on, or just go get your own tomorrow for $79.99 -- after the requisite rebate and contract negotiations, of course. @TMobile (Twitter)