I arrived in the USA on Monday. Intially I had to turn my iPhone 5s on and off several times before it would connect to T mobile and has then went to no service again yesterday. I have tried turning it on and off and turning 4g off in case that helps but it makes no differance. Your agents are busy and there is no option for me to call you using whats app. I’m here for two weeks so I need service. What can be done?