So im thinking of getting a used cheap 3G for jailbreaking, hiking, and general messing around with. Does anyone know if I can just freely no hassle no messing with anything swap sims from my 4 to a 3G frequently? I have a microsim adapter. Ive just dont trust myself to bring my 4 on hikes or bike rides, and I definitely dont want to jailbreak it, although I would really like to use mywi and tv-out once in a while. Getting a cheap spare would solve both problems.