Presenters Zoe Salmon and Matt Edmonson have been tasked by Huff Post Tech and O2 to put their TU Go app through its paces. At the end of August Matt and Zoe embarked on three challenges using the TU Go app - a revolutionary app that frees your O2 number for use across multiple devices (think phones, tablets , PCs and laptops) and even lets you pick up calls and texts over wifi should you have no signal. Best of all, your friends don’t need to have the app for this to work, just you!

DJ Matt was first to be assigned the challenge when he was dispatched to a basement at youth homeless charity Centrepoint without a phone signal! Watch the video above to find out how they got on.

Discover what happened when Matt and Zoe first met on top of the O2 Arena.

Join the conversation about the challenges by going to Twitter and searching for #GotTUGo