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Ive made a few posts lately tossing around ideas for this same situation, as I am overseas a lot.
I finally bit the bullet and decided to give T-Mobile a chance. I got rid of Sprint and signed a one-year contract with T-Mobile, just to give it a shot.
From what I can tell, you can pretty much roam in any country you will encounter, unless you go to some really out of the way places. But most of Africa, China, Middle East, Europe was in their roaming range.
But your going to pay some really hefty roaming charges though. I frequent the Middle East, namely Iraq, the Med, and Europe. Iraq was something like $5.00/minute. We also frequent Cyprus, and that was around $1.50 a minute.
I dont plan on using this phone for just chatting all the time to people, only when I need to make a short phone call to the fuelers, flight planning service, hotel, my driver, etc.
All my lengthy conversations will be over Skype, as it is free and has worked in most of the places I frequent. And also email, as I do most of comm's over that.
(I did a check, and T-mobile does have Asia and europe in its coverage areas).
What I did was get the cheapest plan I could, only 300 minutes a month, since I would rarely be in the US and the Intl minutes dont come out of that 300/month. It was $39.00/month.
Another option is to purchase overseas, a Quad-band, unlocked, GSM phone. Then for the countries you are in, just buy a local Sim chip (that will give you a local cell number), and then use prepaid minutes to fill it up.
The math would say that this method would probably be cheaper, but a little less user-friendly as if you have 8 Sim chips, then you have 8 different phone numbers. I have seen Sim chips sell from 20-80 bucks a pop depending on the country.
I decided to pay a little extra on this trial, just for the piece of mind that my phone will work in whatever country I am in, and people can all reach me over the same phone number, etc. I got tired of having no cell phone and looking at pay phones in terminals I couldnt figure out how to use.....
Now i'm waiting for someone to come back and post a reply saying how T-Mobile service stinks overseas and they hated it.....I knew two people who were using T-Mobile while in Afghanistan and had no problems with it at all.
And I even got to keep the same mobile number I have had for almost 10 years now.
Some people will mention getting a Sat. Phone.
I dunno. I had a Sat phone for the past year, and had the hardest time ever getting it to even get a good signal, and its bulky. The use-charges seemed to be on par with the roaming charges ill be getting now.
Hope this helps.