So you’d like to turn that old iPhone into something a little more useful than an iPod touch, right? Well now you can, just order a replacement SIM from AT&T for $15 (which should come pre-scored so you can use it as a full size or micro SIM).
You can order your “replacement” SIM here: http://www.wireless.att.com/cell-phone-service/accessory-details/?q_sku=sku4530230
After you’ve installed your new SIM card in your iPhone, follow these steps.
Step 1: In order to activate your new SIM without an iPad you’ll need to make AT&T think your browser is actually an iPad. In Firefox you can do this by downloading User Agent Switcher and entering the following information under User Agent:
Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10
Here’s the play by play… After downloading User Agent Switcher, go to Tools -> Default User Agents -> Edit User Agents
Then click New and select User Agent
iPad in the description field, and
Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10 in the User Agent field. Leaving everything else blank.
Click OK , then click OK again to dismiss the User Agent Switcher screen.
Step 2: For this step you’ll need both your IMEI and ICCID numbers, which you can find under Settings -> General -> About on your iPhone. Visit https://dcp2.att.com/OEPClient/openPage?IMEI=A&ICCID=B in your browser, replacing A with your iPhone’s IMEI number and B with your new Micro SIM’s ICCID number.
Step 3: Register for either the $15 or $25 a month data plan.
Step 4: Make sure your iPhone is connected to a WiFi network, then visit http://unlockit.co.nz and tap Continue.
Step 5: Tap Custom APN, then enter Broadband in the APN field.
Step 6: Leaving the remaining fields blank, tap Create Profile, then tap Install, followed by Install Now on the popup.
And there you have it, your very own data only iPhone without having to buy an iPad 3G.