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Hello everyone. This is my first post. I have one of those rare At&t unlimited data accounts. Until now I have used a Sierra Wireless 875u and it has worked fine. I recently bought a Mifi2372 unlocked from Amazon but have been unable to connect with it. It still has the At&t software. However on one of the mifi reviews I read that it was impossible to use this modem with an unlimited account sim card from At&t. Does anybody know if this is true? Any suggestions?