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The Helmholtz Association has provided the funding for the open access charge.

Calls to the long number will be charged 15p plus your network access charge.

Calls to the long number cost 15p plus your network's access charge.

Vodafone has vowed to match its rival's pledge, telling the BBC: "We will waive the access charge during the coronavirus crisis and refund those charges already incurred by patients."

The company charges incoming calls 13p per minute and mobile phone companies add an additional per-minute access charge.