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If you have pre-ordered a #Librem5 #phone, have you checked with your carrier if it will work on their network?
The unlocked modem frequencies can be checked here: https://puri.sm/faq/#faq-61464 "Will my existing SIM card work? What countries and networks will be supported?"
It would be a good idea to ask your existing carrier if they will be supporting the Librem 5. It is known certain carriers whitelist devices allowed on their network, and this could fix a problem before the phone ships.
Many carriers have a user's forum, which is a good place to ask this kind of question.