For in-flight connectivity, you can opt for the same pay-as-you-go rates for cruise trips or you can pay $20 per day for unlimited data. AT&T international phone plans (Image credit: AT&T) ...

The cheapest prepaid plan that money can buy is something like Ultra Mobile's pay-as-you-go plan, which is currently $3 per month for 100 minutes, 100 texts, and 100MB of data.

The Metered plan is a pay-as-you-go option for domestic and international calls. This plan is only a good value if each user averages less than eight minutes of calls per day. The cost for calls ...