If leaning towards buying a used iPhone, make sure to check its IMEI against the blacklist database here: www.imei.info . This website can also provide info if the iPhone is still iCloud-locked to a previous owner.
Most airports will have stores selling phone plans and sim cards. They can give you advice as to which plan will work best for you according to length of stay and the phone you have.
We have our annual family get-together, do some catching-up and share warm fond memories, especially remembering Christmas memories of relatives who passed away.
Have you tried using the questionable sim(s) in another phone, preferable a PM phone? If your sim card works in the other phone, then it must be an issue with your phone.
