I read through the article you linked Dan, but this is talking about monthly plans, rather than top-up sim cards, which I would prefer. Do these exist in the US? Let me just answer your questions and see if you have any tips
Hi Philipp!
The cell plans in the UK/Europe are so different in concept from what we have here, even the terminology is different. "Top-up" is closest to "pay as you go" here, so give that phrase a try when searching plans online.
That said, AT&T stores here offer something called the GoPhone data SIM, available in both SIM and microSIM physical sizes. I "know" about it and have done some basic research, but have not used it personally, nor have my visiting friends. Keep this in mind.
Reading closely, it appears for a USD$15 minimum, you will receive a receipt with a phone number good for talk time and data usage for 30 days (USD$25 for 500Mb of data). Top-offs ("pay as you go") are available at
https://www.myprepaidrefill.com/MobilityUSWeb/enter.do You do have to use the phone number printed on the receipt (the one you got for the USD$15 minimum purchase) and they will text you the PIN you'll need with the number to get logged in. Voice runs USD$0.10/minute, SMS texts are USD$5/200, USD$10/1000, USD$20 for unlimited SMS texts to be used within 30 days. Reports are that voice works okay, data can be iffy, depending on where you are EDGE is the fallback, with 3G being available at best.
Given the length of your planned stay, you could buy 1,000 minutes (usable for 1 year) for USD$100. If you added texting and 100-500Mb of data (both expire in 30 days, so you might not wish to buy more than that to begin), then you could "create" a plan of your own for USD$30-$40/month, about half the price of available carrier plans with similar coverage.
Your phone does have to be unlocked, and the APN data settings must be correct; online forums or your phone's support site/line will help here. Typical data settings might be:
APN: wap.cingular
username: (blank)
password: (blank)
proxy server/URL: wireless.cingular.com
proxy port: 80
I did recently find a pay-as-you-go data wiki that should prove helpful to worldwide travelers, and it includes entries for the US:
http://prepaidwithdata.wikia.com/wiki/Prepaid_SIM_with_data The US section is very detailed and well worth a read:
http://prepaidwithdata.wikia.com/wiki/USA It includes AT&T, T-Mobile, VirginMobile, SIMple Mobile, Red Pocket Mobile, StraightTalk, H
20 Wireless, and ReadySIM. Since you're planning to include Canada in your travels, it might be worth taking a look at Roam Mobility on the list as well. As with many such sites, it is *extremely* useful to read the visitor comments section to find out what works and does not in practice; results and satisfaction vary in practical use and by location.
Hope this helps; happy travels!
Best,
Dan.