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You may not be familiar with USSD (Unstructured Supplementary Service Data) but there's a good chance you've used it before -- by dialing *225# (or something similar) to check the balance on your account. Just like SMS, it's a protocol baked into every GSM phone. Unlike SMS, it allows session-base...

3 years ago 0 Comments
February 29, 2012 at 9:12AM