When i call someone on my iphone they can't hear me and i can't hear them why?

Well it just happened i was calling my dad like 10 minuets ago and then i hung up and then called him 5 minuets later and i could hear him but he can't hear me for some reason why is that?

Added (1). I'm sorry i meant i CAN hear them but they can't hear me

Sounds like a t-mobile problem I always had with them.t-mobile really sucks

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