Ideal would be a dual sim unlocked GSM quad band
phone.
Reality any relatively new (past 4 years) unlocked GSM quad band should
work well.
T Mobile offers an international plan, some have reported data slower than using a local carrier's SIM.
We use local SIM, Skype call, and hotspot feature.
SPOT a good Device to alert
family members where you are and OK, also a handy backup
EPIRB function. Cost ~120, 100/year subscription.
Delorme Inreach next option, similar to spot but allows limited texting and recently OCENS
Marine weather download. Cost ~$300 and monthly subscription varies between $30-$80/month.
Other op