If I activated a new Micro-Sim in an old AT&T Krzr flip phone that currently has the $15 unlimited data plan (using an adapter of course) and then moved it into an iPhone 4 would DATA or calls function AT ALL on the 4 even for a short period of time? Would it ultimately get shut down or would it just be moved to an iPhone data plan or would it just not function at all? Reason is I lost my iPhone a month ago and since the 4 was so close I didn't replace it so I temporarily activated an old Krzr and kept an unlimited data plan on it. Now when i get my "4" I want to get back the unlimited data. I've read the threads about the 2G-> 4 "trick" but since I don't have a 2G I can't do that. Wonder if anyone has tried it with a "non-smartphone" that has an unlimited data plan into a iPhone 4.