Microworkers help

Hello!

I'm new to earning beer money, and I've already got 400 HITs in MTurk plus some $ in Microworkers. Thing is it seems like I can't get the verification codes, no matter what, from mobile code jobs. Anyone got this problem?

Maybe it's because I'm using iPhone, dunno. If anyone could help me I'd appreciate it! Hope you have/had a great day :)