Momentum has revealed plans to revive its army of phonebank volunteers to coincide with Labour’s NHS campaign day this weekend.

The Corbynite group will relaunch the remote phone banking technology – used this summer to propel Jeremy Corbyn to victory – to find more activists for this Saturday’s push in marginal seats.

It said the Grassroots Now campaign will use the Momentum database of members and then encourage people to “bring the NHS back into public hands, as a high-quality, properly funded health service, available to all”.

Momentum has described the phone canvassing website as “revolutionary” and said the party must “modernise” if Labour is to make electoral gains on the back of its new and vast membership, currently at 550,000.

It is similar to the online phone bank technology used by Owen Smith’s leadership campaign, called the “phOwen bank”.

Momentum’s new push aims to mobilise left-wingers around Britain, particularly in key target seats such as Crewe and Nantwich, Hastings and Rye, and Bedford. The group aims to use the technology to mobilise supporters for other upcoming campaign areas, whether Labour or Momentum specific as well as to encourage involvement in local party democracy.

There is a closed Facebook group which those using the phone bank service can post into for advice, which is called Calling for Corbyn.

Adam Klug, Momentum national organiser, said: “This pioneering technology will harness Labour’s membership: spreading our message in communities across the country, securing victories in local elections and by-elections, and building the movement that will win the next general election for Labour.”

“The Tories are running our NHS into the ground. This week we’ll be using the website to mobilise our supporters to talk to people in their communities about Labour’s plans to re-nationalise and restore our NHS, in the key marginal constituencies that Labour needs to win”.