It depends on the venue and provider. A lot of pub type settings will have a note saying that orders placed within 5 min of one another will come out together. In my experience the more upmarket the place, the less likely they are to have ordering via phone (or payment at the time of ordering).

But you can also get someone at the table to place the order for everyone. Or often go and order at the bar (also something that you don't see too much in North America), or if its a restaurant grab a member of staff and order in a more classic way.