For phone I am a Verizon customer so for stays under 30 days use their International plan $10 a day for calling and internet with no charge if not used. On over 30 day stays used another plan for $200 a month unlimited calls and internet. My wife is an ATT customer and does the $10 day International plan but rarely gets calls so no charge for days not used. Phones are set to use wifi for data if available.