I have a friend with whom I text frequently. She has a an AT&T feature phone plan (minutes and test only, no data). Texting with a feature phone is a PIA. I would like to give her an older AT&T Samsung smartphone to use. As both phones have the same size SIM, it would be just a matter of swapping the SIMS. This would let her text easily and would let her access the Net with WIFI. My question is, does AT&T care or will they even know?