I'm having an iphone problem?

My cell phone had a crack in it and my dad decided to bring it to this guy keep in mind that before i had my phone fixed the service was excellent, i had the best service but anyways i wait about two days to get it back and one thing i notice the service bar is only one to two bars almost everywhere i go it wouldn't change unless i was near a cell phone tower. My service changed for some reason so i called my brother and told him that, He said that while the guy was fixing it he could of moved or touched my antenna inside my phone while fixing it. So is that true? Could that be the problem to my horrible service because again it was great before i got the phone fixed.

Yes its possible. Next time bring it to an apple store

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