Heres how I cut my monthly iPhone bill to $20. This is only useful for people who are fairly light users and rely on WiFi for almost all of their data usage. I switched from AT&T to the Airvoice Wireless $10/month plan. Airvoice Wireless is an AT&T MVNO, which means that they run on AT&Ts network. It also means that you can use an AT&T iPhone without the need to jailbreak or unlock it. You also don't need to play any games with the provider since Airvoice allows you to use an iPhone with their service. Here are the charges: $0.04 per minute $0.02 per sms $0.10 per mms $0.33 per MB You need to add a minimum of $10 every 30 days to the account. Any unused funds roll over when you add another $10. What you will need: Airvoice Wireless SIM Card Noosy Micro SIM card cutter (for iPhone 4 or 4S) Airvoice Wireless refill card You will need to cut the Airvoice Wireless SIM down to a MicroSIM using the Noosy. The Noosy comes with the instructions. Its just like using a hole punch. Go to the Airvoice Wireless web site http://www.airvoicewireless.com and click on either New Activation (to get a new phone number) or Port Your Number (if you want to keep your phone number from your existing provider). For the plan select 250 TALK OR 500 TEXT 30 DAYS. Fill in all of your info and submit it. Wait an hour then call 1-888-944-2355 to speak to a customer service representative. Have them double check that your account is set up properly and ask them to enable data on the account. Next you will need to configure your phone to log in to AT&Ts cell towers as an Airvoice subscriber. Make sure that your iPhone is connected to WiFi. Open Safari and go to http://www.unlockit.co.nz. Select Custom APN then go to the Carrier menu and select Airvoice. Select Create Profile, which will bring you to the Install Profile menu on your phone. Select Install and enter your phones password if prompted. Youre all set. Enjoy the savings!