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Question
I am trying to use the GoPhone plan from AT&T on a iPhone 3G. Based on my research here is what I have done so far.
1. Bought a used iPhone 3G 16 GB from a friend.
2. Bought a cheap $10 AT&T GoPhone from BestBuy
3. I activated the SIM card from the new GoPhone online using the SIM card number and the IMEI number for the phone.
4. I bought a minute and data plan online and received my new phone number.
When I put the SIM card in the iPhone I get a "Invalid SIM" message in the upper left hand part of the screen. I also get a message asking me to insert a SIM card with no PIN lock.
At this point I cannot do anything with the iPhone. Any assistance is appreciated
UPDATE: I recently received new information that indicates that you can use a GoPhone SIM with an iPhone. However, in your situation, the iPhone you have is set up to only use a post paid SIM card. Check with AT&T and find out if they can set up your iPhone to be used with a GoPhone SIM card. They may be able to do this. If they can't, then the phone would need to be jailbroken. Hope this helps.
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DebiN
Expertise
I can answer questions on cellular phones, the physical device, the network, contracts, billing, ordering, porting and what to look for when purchasing cell phones. I am located in the United States. I am an expert on BlackBerrys, Treos, HTC devices and iPhones as well as cellphones and aircards. I have over 15 years of experience in both the wireless and wireline world with the carriers. I have a lot of knowledge regarding the wireless providers - their services, prices and policies, both GSM AT&T and T-Mobile) and CDMA (Verizon, Sprint/Nextel). I am very familiar with the individual devices and their specifications. I can also answer questions regarding BlackBerrys, iPhones and other PDAs, both Palm-based and Windows-based. I can troubleshoot most any problem someone is having with their cellular device or with the provider.
Experience
Over 20 years in the Telecom industry working for the carriers with individuals, small business, medium business and large corporations(Fortune 500). Also worked as a professor in Maryland for 10 years teaching telecommunications.
Organizations
I belong to several organizations
Education/Credentials
Master's in Telecommunications
Awards and Honors
Received several awards for papers that I have published over the years
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