How good is the RM at being a phone?

I'm curently using an iphone but is on the verge of buying a redmagic since i do a lot of gaming with my phone. But i'm wondering, how good is the phone aspect of it? I'm mostly wondering if there is any issues with things like sim cards, any wifi issues, is the phone too big and software annoyances? If possible just tell me your experience with the phone as a whole, not the gaming aspect basically! (i know it already rocks at being that)