I am abroad and I have a mobile service error. This is not allowing the phone to connect to any netw

[AndyE69]

My mobile has an error in the mobile service and therefore will not connect to any network. 
phone has been switched off several times and still has an error. 
the phone is an IPhone 11

[caesarome]

What is this error as you haven't said ?

[AndyE69]

in the settings screen, the line that says mobile service instead of saying off it says error, when you then select this it goes to a white screen that says an update is required to use mobile data on this iPhone. 
there are no updates available 

[caesarome]

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@AndyE69 wrote:

you then select this it goes to a white screen that says an update is required to use mobile data on this iPhone. 
there are no updates available 

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That seems to be your issue so there are a few things here to try:

https://discussions.apple.com/thread/8562793