A:AnswerHi Peter. Thank you for bringing this to our attention. I appreciate your taking the time to raise this inquiry regarding the Samsung - Galaxy S21 Ultra. The device comes with a hybrid dual-slot a dedicated SIM card slot and the other one can be used for either a secondary SIM card or a Micro SD card. Please follow the link for more details regarding the phone.
User's manual
https://downloadcenter.samsung.com/content/UM/202201/20220128083813339/SAM_G991_G996_G998_EN_UM_OS12_121721_FINAL_AC.pdf
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference Number: 1144226362
Have a great day.
^Charles
A:AnswerIf you have T-Mobile already and use this phone on your account, you can request to unlock this phone after just a couple days of use through T-Mobile Help on Twitter, just submit a screenshot of your proof of purchase in full and answer yes to all their questions
A:AnswerThat phone doesn't exist.
There are trade in offers for the S21 Ultra though, yes.
T-Mobile usually offers higher trade in value than Best Buy when you choose to pay the phone in full and T-Mobile Help on Twitter will unlock your phone as soon as you've used your phone on your account for a couple days when you provide them with proof of purchase, so trading in your phone with T-Mobile through Best Buy is really nice if you want to unlock your phone quickly and still receive a higher promotional trade in value.
