The cost of using your mobile phone abroad is most likely to cause problems if you jet off without checking your network's prices and carry on using your phone as you would at home.
What should you look out for?
There are some cautionary tales on the Telegraph website, including one customer who ended up with a £16,000 phone bill thanks to listening to online radio on his phone when on holiday!
The biggest mistake you could make is to assume your normal tariff counts overseas. Overseas usage will usually be subject to separate, often significantly higher, charges and you will be billed accordingly, so first check with your network exactly what it costs to use your phone abroad.
This information should be on their website, but give them a call if there is anything you are not sure about.
You can then work out what you are likely to spend by deciding how much you really need to use your phone while you are away.
If you are going on a beach holiday you might be able to manage without using it, but if you re travelling for business then using your phone might be unavoidable.
The EU vs the rest of the world
It is far cheaper to use your mobile in EU countries than it is in the rest of the world because networks are limited by a cost cap.
However, not all European countries are part of the EU. Check this list before you travel to find out if you will get the cheaper EU mobile charges where you are heading on holiday.
If you will not, avoid using your phone as much as you can because it will cost you a lot: you could pay up to £2.50/min for calls, £1 a text and £8/MB data.
Even if you are holidaying in the EU it will still cost you much more to use your mobile than it does in the UK so you need to be careful not to overspend.
What do networks charge to use your phone abroad?
In the EU
The maximum you can be charged to use your phone within an EU country is:
Your domestic rate plus €0.05 per minute to make a call
€0.0114 per minute to receive a call
Your domestic rate plus €0.02 to send a text
Your domestic rate plus €0.05 per Mb of data
From 15th June 2017, roaming charges will be abolished entirely, meaning your mobile network must charge you the domestic price when you are elsewhere in the EU.
Outside the EU
If you use your phone outside the EU, some networks will charge different prices per country, whereas others have standard charges for using your phone abroad - check with your provider.