Martin Lewis is warning people to "act now" to avoid huge price hikes in the coming months.
The Money Saving Expert founder told fans his "heart sank" when the 10.5% inflation figure was announced last week. In his weekly newsletter, he added: "It's that December figure which many broadband and mobile firms base their April increases on.
"Yet they don't stop there - most lump a further 3 or 4 percentage points on top."
