I’ve a prepaid sim card (legacy pay as you go) I am in HK but recently there is no reception when using the SIM card here. I’ve been using to receive verification code in HK all this years & no problem before. My plan is still active. I am not sure if this is because the big SIM card has defect or something wrong with my old mobile phone. Since this is the big SIM card , I do not have a mobile that can insert the big SIM card to try it out. I tried to authorise my cousin to change a small SIM card on my behalf with my authorisation letter but T-Mobile staff in the shop not allow a 3 rd party to do so.Pls advice if I should ask someone to cut the SIM card to a small sim to give a try. Thx.