I have all my family members(4) in the TMobile One and we are traveling to Mexico in April, I understand we have up to 5GB of high speed data within México. My question is Do we need to switch Data roaming setting manually in all our iPhones once we land in the airport or isn’t necessary to turn ON data roaming?
Best answer by Anonymous
You can turn data roaming ON at any time. You don't have to wait until you arrive. If data roaming is OFF you won't get any data service outside the USA.