T-Mobile and other carriers' subscribers have been getting a specific phone call recently.

Do not give away PIN numbers or other personal information if you receive a call like this one.
Many people are eager to save money, and may be tricked into revealing personal data in response to a fraudulent email, text, or call if they think they will save money. A T-Mobile subscriber and Reddit user with the username newbrevity recounted receiving a call from individuals "with Indian accents" who claimed that he would receive a 30% discount on his T-Mobile bill for two years because of his excellent payment history.
The Redditor became wary when the callers stated that they only needed to access his T-Mobile account but did not need any other information. Alarm bells should have been ringing, but the situation worsened when the callers requested his account PIN to view his information.
The T-Mobile subscriber hesitated to provide his PIN, and the caller's response heightened his suspicion. They offered to send him a link to reset his PIN. The subscriber suggested that they provide him with a callback number so he could confirm it with T-Mobile. The callers hung up immediately and did not call back.
The subscriber stated that he had previously been scammed on AT&T, which led him to switch to T-Mobile ten years prior. He visited an AT&T store to resolve a problem. The next day, he received a call from a spoofed "AT&T" number, offering a $50 credit for feedback on his recent support experience. They requested his PIN for verification, and he complied.
The following day, his phone service was disrupted, and he received concerned emails. Upon contacting AT&T, he discovered that scammers had performed a SIM swap, resulting in $2,000 in charges for calls to Cuba.
When he reported the incident to AT&T, they promised a specialist team would handle the refund. However, the callers who contacted him, posing as "AT&T," requested his new PIN before issuing the refund. He refused, finding it absurd that they were using the same tactic as the scammers, and asked for a verifiable callback number. They claimed that the department lacked a callback number and that he would have to provide his PIN to proceed. It took hours of complaints before a supervisor finally issued the refund.
One Redditor commented, "T-Mobile reaching out to save you money? Good on you for being hesitant." Another user advised, "Never answer unknown numbers; let it go to voicemail. If it’s something seriously important they will either say in the voicemail or continue to call back."
A T-Mobile representative stated that the company's policy prohibits its representatives from requesting personally identifiable information during outbound calls. He clarified that T-Mobile representatives are not allowed to ask for that information "even if you call T-Mobile and the call drops before we ask you for your name and PIN, we still aren’t allowed to ask you for that information when we call you back."
Many individuals have reported receiving the same phone call in recent weeks. While most recognize it as a scam and hang up to verify its authenticity with the carrier, some incorrectly blame T-Mobile.
Scammers use social engineering techniques, exploiting human emotions like fear, urgency, and curiosity to manipulate people. They may promise discounts or claim late payments to elicit a response.
A T-Mobile employee shared that legitimate calls from T-Mobile will appear on your phone as originating from "Customer Care."