I have an officially unlocked iPhone 4 from a non-US carrier. Now that I'm in US, if buy a prepaid SIM card from AT&T and use it in iPhone, do I get 3G(WCDMA) or GSM network? To put it in the context, do I see "3G" or "E" in the iPhone status bar?
Could anyone clarify if this chart is correct?
Enable 3G, Enable Cellular Data, Result
Yes , No , Make 3G call; use no data
Yes , Yes , Make 3G call; use 3G data
No , Yes , Make GSM call; use EDGE/GPRS data;
No , No , Make GSM call; use no data;
Best Answer
Presuming that it's not a CMDA iPhone (i.e. not from Verizon/Sprint), you will see '3G' if you're in a 3G coverage area. The Enable 3G and Cellular Data options must be turned on in the Settings.
Sidenote: AT&T requires purchasing a data package for their smartphones; no Pay per use.
As AT&T also had a GSM network, you could also access that (and GPRS/EDGE as well).
Usual Terms and Conditions will probably apply.