Over next three weeks, I want to use Rick's walking tours in Vienna, Munich, Rothenburg and Salzburg on my iPhone. I have all the tours download on my phone.
I have arranged for International $10.00 a day when used plan but hope to keep my phone on "Airplane mode" to avoid any unauthorized calls.
What do I need to do to keep cost down and still use App or since tours are downloaded is there any charge from Verizon?