I just tried the code you posted. But I'm getting the same result like with my code. The loop is somehow not entered as well:
Enter AT command:ATI
From my understanding it should at least print the buffer size one time if there is 1 byte of data. The AT-command (ATI) I'm trying should give me something like this:
Manufacturer: Company Name
Revision: AABBCCDDEE-123456 1 [Dec 01 2012 14:00:00]
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