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I had this same thing happen when I first signed up for T-Mobile. My first billing cycle was 4 days, and it actually included the first month of service along with the prorated amount for the 4 days. Most carriers bill in advance for the next month's service as opposed to billing in arrears, so this is not uncommon.
I was surprised also. Att billed at end of period. the First page of my bill doesn’t show the actual service period being invoiced for. They instead show a 1 day period. Appears to be that They hide this on the 3rd page of invoice for some reason. customer service was unable to explain this to me. when I asked why I wasn’t prorated for 1 day of service and am being invoiced for a whole month when I only used a day, they cynically replied that their service isnt free. Tmobile Needs to change communication on first bill to show service dates on first page and have customer service reps prepared to answer what seems like would be a common question.