It's equivalent to no network. Even on our phones (unless u're near to land).. If u have to use their internet, it's available but really expensive..
Both our young kids enjoyed the RC cruises that we've on.. There are "rooms" for them to have activities.. For the age restriction and playrooms, it depends on the ship and services.. There are also certain events on certain ships.. They can also take a dip in the pools/jacuzzi with the adults.. Diapers aren't allowed and they have to be toilet trained though.. They will also enjoy watching the sea and running around on deck.. It's quite fun actually.. If u take junior suite room, they even have bathtub in the bathroom which young kids will enjoy while parents relax..
IMO, starcruise sucks.. No offence intended.. Service also cannot make it.. Not being bias but u will understand once u've tried RC.. Service is the key.. Food as well..
A tip I read on a website review: if u book higher deck rooms, service will be better cos it's near all the "expensive" types of rooms which will have the best staff.. I think it might be true cos we took their balcony and junior suite rooms in different ships.. So I'm guessing those who took the interior cabins on same levels also had the same sweet cabin staffs..
Although i'm pretty sure all the other level staffs are just as awesome..
If u're going with kids, better to take those rooms that uses sofa beds instead of bunkbeds.. More spacious.. And if u're using stroller, u can request for accessible rooms (bigger rooms, with ramps and bigger toilets..)
Port of call depends on which package u take..