If I turn off the network on an IPhone will i still get texts or calls?

Okay so I'm going to the Caribbean in a few weeks and I was wondering about my iPhone. I don't have an international data plan, so I was planning on turning off my network. It says online that you can iMessage people through Wi-Fi. But if i turn it off will i get the messages i missed after I turn it back on? And will i charged for my iMessages?

I just got back from Poland where I went for a couple of weeks. IMessage will not work even if you have Wi-Fi. You won't be able to call or txt unless you call your provider and tell them to activate your SIM card. I called Verizon and supposedly they did this for me, but I still couldn't get calls, txts, or iMessages. To be on the safe side, install these two apps that use Wi-Fi for communication. Whatsapp and Viber. Viber can call and message to other iPhone users who have Viber and is free. Whatsapp can message other Whatsapp users, but it's nice because Whatsapp is not limited to iPhones. Other smart phones can install it too.

Your Imessage most to be free even if you turn your network off, lots of places have Wi-Fi in all countries