It’s round two of the TU Go challenge and time to get digging.

For their latest mission, we've asked presenters Matt Edmonson and Zoe Salmon to put their green fingers to the test and fix up a community garden in Lewisham for youth homelessness charity Centrepoint, with the help of groundbreaking (sorry) new app TU Go.

TU Go works by freeing up your O2 mobile number to roam across all manner of devices, from tablets to PCs, and even lets you make calls over wifi when you lose signal, a real bonus if you find yourself working out of doors.

We’ve already sent Matt and Zoe to the top of the O2 Arena and challenged them to put together a basement recording studio, so how will they fare in the open air and will Matt be able to avoid making another awful gardening pun? Watch the latest video to find out.

Join the conversation on Twitter at #GotTUGo