A:Answer Hi Chris,
Thank you for bringing this to our attention, and interested in whether the Galaxy S21 Ultra (Unlocked) works with Mexican Carriers, such as Telcel. In line with this, unlocked Samsung phones work on multiple networks. Also, it gives you the freedom to switch carriers any time and make sure that you have a compatible SIM card. Please note that sim cards must be compatible with the area's available networks. International calling, data services, and coverage vary by the network provider. Contact provider for details.
You may visit our website for more information about unlocked phones: https://www.samsung.com/us/mobile/phones/unlocked-by-samsung/.
You may also check out our website under the "Learn about unlocked phones" section for further information:
https://www.samsung.com/us/smartphones/galaxy-s21-5g/buy/galaxy-s21-ultra-5g-128gb-unlocked-sm-g998uzkaxaa/
Should you need more assistance, you may reach us via the following for immediate support:
1. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
2. Facebook Messenger: http://m.me/samsungsupport
3. Twitter: https://twitter.com/messages/compose?recepient_ id=18768513
Reference Number: 1144317308
Thank you for choosing Samsung. Have a great day!
^Chrystel