Unless im overlooking something this looks like a pretty easy fix! Offer them the gophone 60.00 smartphone plan. I took a glance at alltels website and there prepaid starts at 45.00 for just talk & text with data starting at 15.00 extra for just 250 mb's and 2 gb which is what you would get with ATT is 25.00 extra. So again whats the major prob?? Offer them gophone! Same Att nationwide network as postpaid gets. Which is great. I have it & am satisfied using an unlocked Tmobile phone right now. Unless the Alltel customer only wants talk & text, Well At&t GoPhone plan is only 5.00 more. Again I think there are more serious issues.. If they really make a stink they could just match the price.
Keep in mind that if they were to do that they would also have to replace the phones for the customers. The Alltel phones are CDMA and the att phones are GSM. Albeit, the cost of replacing those phones is likely minimal compared to receiving $60 per m...