The first nationwide carrier to be awarded the Seal of Wireless Quality. For details, visit www.ctia.org. This link will open a new window.
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Cingular won't activate my AT&T SIM chip. Anonymous May 30. I have thought of hacking the SIM card to a Cingular ID number. Activate SIM Card AT&T. Solved: I recently bought a phone from Best Buy and had it shipped to me and it came with a brand new SIM card and I wasn't competely sure on what to. AT&T did obsolete the Cingular-era and pre-merger AT&T SIMs, but that was 3-4 years ago. Is your carrier AT&T or T-Mo? If AT&T and the 'old' SIM is.