Rory Cellan-Jones
Media playback is unsupported on your device
Video

Why going online on smartphones can be costly

The BBC's Technology correspondent Rory Cellan-Jones looks at how some people are getting unexpectedly large bills after going online on their smartphones.

Mobile phone firms have been warned by the Communications Ombudsman that they must do more to help people avoid getting big bills after going over their data tariff allowance.

Go to next video: Mobile data 'clarity needed'