Help, I am unable to make a voice call in the USA, but I can an SMS. I have purchased an out of plan add on and set my roaming on my Android phone. The APN appears correct also. But the call is ended immediately. What have I not done?
Found it. For all USA travellers, switch off automatic network selection for your Smarty SIM and make sure AT&T is not selected. As they do not appear to work. I selected T-Mobile and it worked perfectly.
