People have told ITV News if they feel they are getting value for money from their contracts:
Many of us do not realise how we are using up our allowances.
People are unaware that video calling a friend through the Skype app (51%), logging into Facebook through an app (43%) and having a Twitter app stored on the phone though not in use (81%), all eat up their data quota.
Of the £5 billion people are wasting each year, £173 million comes from additional data charges for accessing the internet.
Just over a tenth of people (12%) know what 1MB costs them outside of the data included in their contact.
A new report claims people are wasting £5 billion by being on the wrong mobile phone tariff.
The study found nearly half of us (47%) are unaware of the data allowance and the number of free minutes and texts on our contracts.
Researchers say this is costing each person on average £194 a year.