If my phone is synced to another phone can they recieve my calls and hear the conversation

My friend google sync my phone can they see whos calling me and hear the conversation

Do you mean he added your Google account to his phone? Or something else? You can't "sync one phone to another phone".

Please register an account here so you can continue the conversation here, instead of starting a new one every time you post.

If he added your Google account to account to his phone, he can see your email and anything you sync to Google or send to your Drive account. He can't hear your conversations or see who's calling you - that goes by phone number, not by Google account.