Is there any apps I can message on without Wi-Fi or internet connection?

I'm going away to France for a week with family and would be able to message my friends, in England, when I have no Wi-Fi or internet connection. I have iPhone 5 iOS 8 or 9 with the uk App Store, but the app has to be thank you for your

Without cellular internet connect (data or phone service), and no Wi-Fi, how were you thinking you'd be able to send text or email? Carrier Pigeon or Magic?

iPhones can use SMS phone number to phone number to send SMS. This of course requires an active cellular connection. This is pretty spendy of you do not have an international roaming data/voice plan. IMessages uses data, Cellular data connection or Wi-Fi. Without either of those options, you will not be saying hi to friends back home, without Magic or Carrier Pigeons.