Galaxy note 4 won't read sim card

[AC Question]

I switched my galaxy note 4 from Verizon to cricket. Phone was fine for about three months then my dumb self took my cricket sim card out and then put my Verizon one back in and then put my cricket one back in and all of a sudden it stopped reading any sim card sent it to samsung they said there was water damage to mother board but I never have dropped this phone in water ever never took it in the bathroom for a shower nothing babied the phone contacted verizon to see if they could help but they couldn't figure it out so they referred me to ask everyone here. I have tried rebooting my phone twice factory reset and it did nothing tried putting in the apn and switched it to global still nothing. Please help me out this is bugging me