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Cellular Phones/3G Sim Card in 8700 blackbery
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Question
Can a T-Mobile (unlocked) 8700 Blackberry use a ATT 3G sim card ? When I put in sim it says invalid sim . I currently have an ATT account.
Thanks
It sounds as though the T-Mobile BlackBerry is not SIM unlocked. If it shows Invalid SIM, it means that the device is not able to recognize the SIM and is locked to T-Mobile. Did someone tell you that the BlackBerry was unlocked? I ask because I don't believe it is. Also, the 8700 is an old BlackBerry. I wouldn't bother with this device at all. I strongly recommend you buy an AT&T branded BlackBerry. A BlackBerry will not work unless you get one from your carrier and you get a BlackBerry data plan added to your account. I hope this helps. None of this has anything to do with a 3G SIM card. An AT&T SIM works in any GSM phone that is branded by AT&T or unlocked. Thanks. DebiN
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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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