So I leave for spain tomorrow (from US), and i want to be in contact with my family, twitter, instagram, etc. However, i'm not into running up my bill just for my social needs. I downloaded the app heywire because it say i can text internationally from it and it is free, however i don't understand technology very much and want some answers.
1) if people text me on the number from the heywire app, is that free? Or do they need to get the app as well?
2) it says i can call from the app… Is that going to cost money like making a call regularly would?
3) i was told that if i'm on Wi-Fi, iMessages will send for free because they are through 3G usually… Is this true?
4) if i'm on Wi-Fi, will my twitter, instagram, vine, etc work with no extra charge?