Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Pre-Order The T-Mobile iPhone 5 Now Starting From $99
T-Mobile opened pre-orders for the iPhone 5 on the recently released “un-carrier” unlimited plan today.
T-Mobile plans start out at $50/month for 500mb of data with throttled data or you can choose the $70/month plan which would give you unlimited data and your data will not get throttled. The iPhone 5 will be available from T-Mobile on April 12th. Customers will be available to make use of the fast LTE network T-Mobile are continuing to build, also they should see an improvement in call quality as soon T-Mobile will roll out HD Voice service via a software update.