Orange UK on Monday launched a price plan that will allow prepay users to go overdrawn on their account in case they run out of credit at an inconvenient moment.

The Reserve Tank is a £2.50 overdraft facility that kicks in when a user’s credit has expired as was announced as the operator rehashed its Pay As You Go tariffs.

The Speak Easy plan, which launched Monday, guarantees customers that it will cost them a flat rate of £0.15 per minute to call almost anyone on any network at any time.

Orange has also increased its Magic Numbers offer, so prepay customers can nominate three numbers when they join Orange rather than just one, with calls to Magic Numbers costing £0.15 for an hour.