I was affected by this, they SIM swapped a line on our account twice, both times on Friday at 5:23pm (followed by swapping the old SIM back at 5:42pm).
Just received the CPNI notice today from T-Mobile, we had a 6 digit PIN set prior to the first SIM swap on January 10th, and changed it before the following SIM swap on January 17th.
T-Mobile told me these swaps occurred at a store for both attacks. I did remove all authorized users from the account prior to the SIM swap on the 17th. T-Mobile has refused to provide Seattle Police Dept with any info about the fraudulent activity, and left me in the dark prior to the letter today.
Just received the CPNI notice today from T-Mobile, we had a 6 digit PIN set prior to the first SIM swap on January 10th, and changed it before the following SIM swap on January 17th.
T-Mobile told me these swaps occurred at a store for both attacks. I did remove all authorized users from the account prior to the SIM swap on the 17th. T-Mobile has refused to provide Seattle Police Dept with any info about the fraudulent activity, and left me in the dark prior to the letter today.