I have TMobile and this number called me....and my bill was a week past due. However, I learned along time ago never to give any info when soemone else calls me so I called TMobile back and they said that this is not a number that they use. If you get called about your account it will either be from a local area code (I am in Washington, not wherever 520 is), an 866, 877 or 802 areacode, just FYI.