I wish there were GPRS-only plans. They're everything I need for Threema/WhatsApp/FB Messenger/whatever - which saves my friends $$$ on texts. My advice as an

I wish there were GPRS-only plans. They're everything I need for Threema/WhatsApp/FB Messenger/whatever - which saves my friends $$$ on texts. My advice as an "iPhone under-user" (often without data plan): Forevermap is an OSM-based offline map app, and is good enough in many countries. Definitely good enough to find your way home. Never install Facebook with the excuse of messaging. The Facebook Messenger app is much more focused. There's an iOS app that has a relatively recent dump of StackOverflow if you want to code on the train. I'm not sure if I want to recommend it as the UI is really sketchy, but it has helped me.