First: Take your phone with you (unless you lose it often... I'm talking 5 times a week, in which case, don't take it with you)
Your smartphone is such a valuable tool abroad, there are lots of tricks to using it to it's maximum potential without breaking the bank.
Second: Turn off 3G/4G and stick to WiFi
Wifi is free, for the most part, at cafes and large businesses. So look for window stickers/signs or ask employees about Wifi. If you don't see a sign, it doesn't hurt to ask.
If you see that, you're pretty much golden.
Third: Applications
The number of helpful applications abroad is astounding. I'm not about to give you a long list, I'll do that later, but know there are a lot. And a key application to communication back home will be Skype. If you haven't heard of it, time to come out from under your rock. Skype is free...for the most part. The only parts of Skype that are not free are
-calls to mobile and landlines
-text messages to mobile phones
-group calls with more than 10 people
But Skype messaging and video chats are free and great for communicating with family and friends.
Fourth: Jail Breaking
I don't recommend it, if you want to do that, go ahead but I would advise you to look it up and what the consequences are. There are lots of pros and cons.
If I think of any other important info about your phones abroad, I'll update this. In the meanwhile, feel free to ask questions in the comments. Or just say hi.
Bisous Bisous,