Before purchasing or upgrading phone service with a seller who provides miles, I suggest you compare the phone prices to those offered from the cell phone company directly (either online, at store or by phone). I found that the intermediate seller offering miles often had higher prices, and since the purpose of miles is typically to save money by getting free tickets, unless you need the miles for a particular award or to keep your mileage account alive, getting miles for phone service may not be a good value.