Transfer mobile carrier service while out of the country
I purchased the new iPhone 17 Air while in California and transferred my AT&T California number to the new iPhone 17 Air. I now live in LA Paz BCS Mexico and want to purchase the iPhone 17 Pro and my question is, with a new unlocked iPhone 17 Pro purchased here in LA Paz BCS Mexico from Telcel, can I transfer my AT&T California mobile number to the new iPhone 17 Pro or do I need to be back in the United States to do so?
Please advise,
Thanks,
Graham