I used my 6T for 1 year and 9 months without a major problem. Oftentimes, the GPS did not work (very aggravating), but it was intermittent so I could not ask OnePlus to troubleshoot.On October 2021, a day or two after the OS 11 rollout, I found out that I was not getting text messages (my customer could not reach me and as a result, I lost some income). I spent hours troubleshooting with the network carrier and OnePlus. After several weeks, I got a sense that OS 11 was the culprit. I talked to a rep who acknowledged that OS 11 glitch was the cause and several other reps who didn't know about the issue or denied that OS 11 is the cause. Even to this day, after OnePlus techs have acknowledged this as OS 11 glitch (that is, after six months from the start of the issue), some reps are trying to put the blame on the user.I had bought the 6T because of its features and price. Through this experience, I have learned that the sum that I saved is not worth the lost income, many hours that I have accumulated troubleshooting, and the aggravation talking to the reps. For the last two days, I have been trying to schedule a remote session, which an OnePlus rep suggested. And, it's been painful (the rep gave me a time range and when I picked a time, she didn't reply).The only other phone brand that I have used is Samsung Galaxy. I used several models for close to seven years. GPS worked well and no network issues. I am learning the hard way that I made a mistake.
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