Hello. I have bought an iPhone and I have disabled it and I am currently using it on TIM(Brasil). I have configured my email account and I as I know, it automatically connects to any internet every 5 minutes or so and gets all emails from the server. But what I want is to disable the EDGE service because ehre it is 5 dollars per megabyte, which is extremely expensive. How can I program the iPhone to only use Wi-fi or another way to solve my problem?