I've got an Alcatel One Touch Y580 mobile WiFi device which works on 900/1700/1900/2100 MHz for 3G. I have a Vodafone Ireland SIM card which roams using AT&T in the US. AT&T use 850 and 1900 for 3G but don't use both frequencies in all states. So I can only pick up AT&T where they are on 1900 as my device doesn't have 850.
I have just come back from a visit there and the device didn't pick up AT&T in Pennsylvania and New Jersey, but worked in New York and Maryland states.
Is there a list of which states AT&T use 1900?
I have also got a Three SIM card which works on both AT&T and T-Mobile, meaning that I can use that where Vodafone Ireland doesn't work as T-Mobile 3G is on 1900. But Three is usually painfully slow and not viable for streaming radio, whereas Vodafone Ireland worked brilliantly (where it was available).
I have just come back from a visit there and the device didn't pick up AT&T in Pennsylvania and New Jersey, but worked in New York and Maryland states.
Is there a list of which states AT&T use 1900?
I have also got a Three SIM card which works on both AT&T and T-Mobile, meaning that I can use that where Vodafone Ireland doesn't work as T-Mobile 3G is on 1900. But Three is usually painfully slow and not viable for streaming radio, whereas Vodafone Ireland worked brilliantly (where it was available).