Of course, it can only be used when you have both an active Wi-Fi and mobile data connection at the same time, so won't be useful when you are out and about without Wi-Fi.

Of course, it can only be used when you have both an active Wi-Fi and mobile data connection at the same time, so won't be useful when you are out and about without Wi-Fi.

If you're used to paying with the mobile, it's more advisable to keep it on, as this will be more comfortable and quicker for each payment, but it's also not dramatic if you disconnect it. Here's how ...