If you’re travelling to Europe, changes in the law for European roaming charges have meant that you can use your monthly allowances of calls, data and texts with no extra charge (with a few exceptions), but go beyond those allowances and you could face a large bill. With many apps able to run undetected in the background, uploading images or downloading updates, your limit could be used up very quickly without you even realising. If you want to make sure you don’t go over your limit, the key settings to change are Data Roaming and, to be safe, all push notifications on your apps.