Before sending your phone to T-Mobile, be sure to check the details.

T-Mobile's Yearly Upgrade program lets customers upgrade their phones every year instead of every two years. Customers can trade in their phone for a new model after holding it for six months and paying off at least 50% of the device cost, which equals a minimum of 12 monthly payments. When trading in, T-Mobile covers the remaining 50% of the balance, enabling the customer to start a new installment plan for a new phone.

One T-Mobile subscriber on Reddit, who transitioned from Forever Upgrade to Yearly Upgrade, mentioned upgrading his iPhone annually. He preferred in-store trade-ins to avoid potential issues. He cited instances of lost phones during the shipping process, leaving customers without their trade-in or new device.

However, this year, he was required to ship his trade-in, aligning with the Yearly Upgrade plan's rules. He recorded himself dropping off the package at UPS but didn't include the phone's IMEI number in the video.

Subsequently, he received an email from T-Mobile stating that the received phone was not the expected iPhone 16 Pro with IMEI number 357324795689275. The Yearly Upgrade plan mandates that the traded-in unit must be the exact phone received from T-Mobile the previous year. The email suggested a possible mix-up and sending of the wrong phone.

Instead of receiving an iPhone 17 Pro, the customer got a $504.07 credit toward his iPhone 16 Pro installment balance. The email also warned of potential loss of promotional offers. Consequently, the customer lost both his new phone and the traded-in phone, which he claimed was the iPhone 16 Pro he received from T-Mobile.

Other subscribers reported similar issues, with one receiving only a $1 credit instead of complete balance wipeout. For those using the Yearly Upgrade program, one T-Mobile subscriber advised documenting the trade-in process: "I take pictures of the box's weight, the phone itself, then the phone in the box on the scale, seal it, and get a receipt when dropping it off at USPS. It's unfortunate, but I've been burned before."

Another T-Mobile customer, whose trade-in was also lost, speculated about potential fraud within the contracting company, saying, "I think there is massive fraud going on with the contracting company. We had to deal with a lost phone for months while T-Mobile kept our account in the negative by $1,300."

When returning a phone, customers should assume potential loss and document everything with photos or videos to potentially save a significant amount of money.

In other news, "Iconic Phones: Revolution at Your Fingertips," a coffee table book about the 21st century's tech revolution, will be released in a few months.

Lastly, Nomad eSIM is offering 30% off data-only plans with global coverage using code IPHONEARENA30.