Just buy T-Mobile. Its cheap and compatible with the current iphone hardware. Looks like its worth around 10 billion. They could just write a check. Its actually right up apple's alley given their hostorical desire to control everything under the umbrella. They would obviously have to make significant investments to to get the network up to par with ATT and Verizon, but the returns are there. The iphone would be untouchable if Apple controlled the networks. They would change the whole industry. Better yet, Deutch Telekom wants to sell.
http://www.reuters.com/article/idUSTRE6141ZD20100205
http://www.reuters.com/article/idUSTRE6141ZD20100205