You can put together a raspberry-pi temp controller with wifi that could then be accessible (and controllable) from a web interface therefore allowing the use of mobile devices that have a browser. A bit of research, some money, time, and desire and it too can be yours
Do a solid search on brewbit. They tanked hard. Software was buggy and it would often fail with one outlet on causing you to continually heat or cool your beer. Neat concept with amateur execution.
I have heard rumors that ohmbrew will be adding wifi at some point, but I don’t think I have ever seen anything official saying this is true.
I’ve wanted to build a brewpi setup, but I’m way more interested in an out of the box solution.