3 Replies Latest reply: Sep 25, 2013 12:25 PM by tmo_leah RSS

Unlocked at&t iphone 4 - Can't hear incoming and outgoing calls

I have an unlocked iphone 4 from AT&T and I just got a newly activated sim card 6 days ago. Data and sms works perfectly and signal is excellent. However, I cannot hear anyone on the line if I make or receive calls. The phone can make and receive calls, but if answered, I cannot hear anything, completely silent. This has been the issue since day 1 of activation.I am sure that there is nothing wrong with phone because other voice application works   (skype without using speaker and viber)  and have done 2 hard resets on it already. I have already called T mobile's technical support twice and none have resolved this case. Pls help  I am very frustrated! Thanks