If you use a lot of data and know you’ll be staying abroad for longer, it might be worth considering a local SIM – this could work out cheaper. Just remember:
If you have a dual SIM device – for example, iPhone 11 - you may even be able to use your UK SIM and the local SIM at the same time. This means you’d receive calls and text from UK friends on your UK number free of charge, and could use your local SIM for outgoing calls, texts and data
Avoid accidentally using your data by turning off mobile data and/or data roaming on your phone. This can be done in your device’s settings and will even stop apps/services that use data when running in the background.
If you don’t use your phone on a given day, we’ll assume that’s time spent back in the UK and it won’t be added to your roaming charges.