I brought my unlocked Galaxy s21 ultra from tmobile on June 8th and i thoroughly regret my decision. First of all, come to find out that advanced messages (RCS) is only available on a phone 3 years old and customer service has no answers. I spent a lot of money on this phone and i expect all the features to work. Secondly, because my phone is unlocked, i can't subscribe to call filter plus which is garbage. Lastly, i had rebates from switching and it is really going to take 8 to 10 weeks before they process? That is ridiculous. Didn't have any of these problems on tmobile. For a company that claims they are number one in their field, they are sure behind t-mobile and at&t. Spoke with NUMEROUS customer service reps and no one ever has an answer for me. Im told with rcs that my phone is not compatible despite being the latest and greatest. Regarding rcs, im told because my phone is unlocked, its not compatible. UNACCEPTABLE!!! A simple software update would fix all these issues. If none of this can be fixed, i will be taking my business else where.