The easiest way to avoid mobile malware if to, uh, not use a mobile phone for everything. People think they're in control of their iPhones or Smart Phones, but if the little shiney communication boxes become so necessary to function every day, who is actually in control. I mean, really. Do you want to be a mobot or what?
No one wants to hear it either, but if you like remembering stuff, spend time off the phone. Lots of time off. Look up the studies by L.G. Salford on (poor little) rats that showed (again and again) how microwave exposure made a fluid called albumin leak into their brains, wrecking and killing brain neurons, and screwing up their memories. Don't be like those (poor little) rats. Live some (or most?) of your life off-line. It's a whole new, actual world out there waiting for you to explore!