Network Coverage Error when connect to MOBILE DATA
i have a Xperia V. it's good.
but this week ,when i connect to MOBILE DATA, understand that ANYBODY can't Call me. it means that network not available.
there's NO sign in Notification & everything is ok (in Status bar). and it seems everything is ok. but in this Condition (Using Mobile Data) if anybody call me, it says Network Not Available for User.
Please Help me.