Oasis Question: Unlimited Internet and iMessages

[adriannaNL]

I'm wondering how the unlimited internet package works for connectivity onboard the Oasis of the Seas. Do you have to continually sign in to the system on your phone's browser every time the phone sleeps or do you sign in once and then it's good to go for a long period of time? My mother and I are hoping to use iMessages on our phone to locate each other throughout the day while on board and it probably won't work if the connection is not automatic. Thoughts?