Hi, I'm planning on traveling to the US and Europe in the near future
> so I'd appreciate some recommendations on which providers I should use
> for cell service and phone/calling cards.
See
The short answer is this:
For the U.S., get a TDMA service from
The other good option in the U.S. is CallPlus TDMA
What about GSM in the U.S.?
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GSM service in the U.S. is not great, with large areas still having no coverage. SIM cards are quite expensive, as are prepaid minutes. If you go the GSM route, avoid T-Mobile, and go with Cingular, and be certain to get a phone that supports 800 Mhz and 1900 Mhz GSM (800 Mhz is sometimes called 850 Mhz).
What about CDMA in the U.S.?
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Coverage is excellent, but prepaid CDMA is more expensive than prepaid TDMA.
Europe
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For Europe, the best deal is to obtain an unlocked dual band (900/1800 Mhz) GSM phone, and then use Riiing. You didn't say where you are located, you can see the Riiing product at
GSM Phone for Europe and Riiing
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Triband GSM phones (900/1800 & 1900) are very cheap now, because they are not well-suited for the U.S. anymore because most GSM is at 800 Mhz. See