Do I take my iPhone to Verizon or Apple?

My iPhone 4 has been giving me issues lately. It's being really slow, shutting off, not receiving texts all the time; etc. I want to get it checked out (my carrier is Verizon) So do I take it into Apple or Verizon?

I would try apple first. Bc it's slow and shuts off.

Either one can help but apple will charge you. Try verizon first

Bring it into Apple. It is their obligation to help with your phone, since Apple is the company that sells the iPhone regardless of what carrier it is on.

Apple can also not charge you unless they have to do a significant repair, but that probably won't be the case. If it is, Verizon may be able to help you but remember that they're really only responsible for the 3G into --> the phone.

Only go to Verizon if you have specific problems with calling, texting, or data.