Phone numbers, account numbers, passwords and financial information was not compromised, the company said.
Payment information like credit card numbers was not stolen either.
T-Mobile already has reset the PINs for prepaid customers and encouraged others to reset them, as well.
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Affected customers will be given free identity protection with McAfees ID Theft Protection Service for two years.
T-Mobile is recommending its customers to advantage of its Account Takeover Protection service.
The access point that was used to gain entry has been closed.
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T-Mobile states it will continue the investigation and cooperate with law enforcement as it learns more about the attack.
