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I live in the DC area and have been told GSM / GPRS will work, but if I travel outside the area I could have problems.
Is it better to go with a TDMA phone for now and upgrade later?
Right now I am considering a Nokia 3360 phone or a Panasonic Versio. I don't use the phone very often, barely have the one I have now on, but don't want a POS.
The most frequently used ones areCDMA, TDMA, iDEN, GSM.
The only company using TDMA is AT&T Wireless, and they are phasing it out in lieu of GSM. Problem with their GSM is they use a different frequency then everywhere else in the world.
My suggestion is that you pick the vendor first, then see what phones you can use with them. Most vendors will not allow you to use your own telephone. They want you to buy "theirs".
The phone is a Handspring VisorPhone - I already used a Visor, and I'll be damned if I'm going to manage more than one address book. The only other option would be a Treo (Warning: my brother in law tells me that they took the ability to search your address book by company out of the Treos!) or another integrated cell phone and PDA. It's a GSM phone, and I haven't had many coverage problems. Of course, so far I've taken the phone with me only to places I checked on the coverage map before buying or to Washington, DC.