When the sim card arrived, I tried it in the phone and it would not work - it just said 'check sim'.
A couple of points to note:
1) I am pretty sure the phone is unlocked - I have tried a couple of sims in it such as Giffgaff and BT mobile and both work fine.
2) The sim card appears to work ok in my main phone (a Samsung Galaxy S8).
So my question is whether this could be because it is a new sim in an old phone - should ID mobile sims work in any phone regardless of age?
If anyone else has come across this issue or has any suggestions it would be much appreciated.
Best answer by MrsH
If your using it in a 2g phone, I think ID is 3g and 4g only same as Three. This is my assumption as it works fine in your Samsung.
Best option might be to use a spare phone that is 3g compatible.
Hope this helps.