If your phone says SOS Only or won't connect to the network this is most likely because your phone is locked to your home network, and you didn't unlock it before arriving in the USA.  However, it may also be because your phone is not compatible with the USA AT&T network.


Requirement to use a network unlocked phone


The USA sim card will ONLY work in an unlocked phone.


To unlock your phone please call your home carrier (eg Telstra, Optus, Vodafone) and request your phone be unlocked.


If you are 100% certain that your phone is unlocked, and yet you still see SOS Only on your phone, or it won't connect to the network, then your sim card may be faulty/damaged.  Please visit an AT&T store and request a replacement "GoPhone" sim card - the AT&T store will be able to transfer your plan to the new sim card.  You can locate your nearest AT&T by searching here: http://www.att.com/maps/store-locator.html#fbid=NrQ3rXSchcM


Requirement to use a compatible phone


The overwhelming majority of phones are compatible with the USA sim card, include all iPhones and most other modern smartphones.


If the USA sim card has been inserted into your phone, but there is no network coverage (ie the phone is not connecting to the network/you don't see any signal connection) then it may be that your phone is not compatible.  To find out more please click here.


If it turns out that your phone is not compatible (this is most likely if you are using an old mobile phone) then the easiest solution is to purchase a cheap prepaid "AT&T GoPhone" handset from Walmart, Walgreens or an AT&T store.  A cheap handset will likely cost about $20.  In the event that the sim card does not fit the new phone, please visit an AT&T store and request a replacement "GoPhone" sim card.  You need only tell the store that you have an active GoPhone account and need a new sim card.  You will be provided with a free replacement sim card and your plan will be copied to your new sim card.  Your USA number will remain the same.  To locate your nearest AT&T please go click here on the AT&T store locator.