My phone keeps breaking up and i don't know why?

my Kin onem is ( for lack of better words) being stupid. Every time i call my mom the call keeps breaking up or getting dropped. I dropped it yesterday but it didn't even get scratched so it couldn't have been that. Is it because our phone just don't work well together or something like that. its bothering me cause my mom thinks im egnoring her or hanging up on her. is there something i can do, or can i at least get an exsplaination to why this is happening.