Oneplus 3t contacts app sucks

[AC Question]

I just upgraded from a galaxy s4. Love the phone but the contacts, call and SMS apps suck! No alphabet side bar and the search function gives random answers, find i'm scrolling for days to call or send a msg. Tried a few other apps but none seem to work together well. Wish there was a good all in one contacts/call/SMS app for Android! Any suggestions?