United-Mobile on Cruise ship

[Bossman]

That's definitely correct. I was actually refering to the fact that if the network selection was on auto.

In my experience, even up to 1 - 2 hrs after leaving some ports, the signal from the local network is sometimes stronger than the ship's. Also, some of these islands are so close to each other, so most of the time one will get a local network.

Originally Posted by bbob

Bossman, to my knowledge if you are logged into a local network but still on the ship you are logged into that network and can't receive calls through the ships network.

On most phone's if you set the network selection to manual and select the local network. Ones out of range you would have to select the ships network manually.
when set to automatic than you would indeed have the risk of the phone switching to the ships network.