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Question
When I upgraded my cellphone last year I just used the old sim card in the new phone.AT&T.CallS are OK. I do not text or surf on the Phone.TO WHAT USE CAN I PUT THE NEWER SIM CARD THAT CAME WITH THE NEW PHONE.IT IS A HALF BLUE/HALF WHITE CARD WITH THE ORANGE 3G LOGO ON IT.
You should be using the new SIM card as it is likely an updated SIM. You can do absolutely nothing with the new SIM except have it activated which will deactivate your old SIM. To do this, contact AT&T and they can activate your new SIM. Unless you have numbers stored on your SIM, there is no reason to use your old SIM. Especially if your old SIM is not 3G, you should definitely use the new SIM. At an AT&T store, they can also activate your new SIM for you. I hope this hleps.
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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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