What information do you require from me in order to be activated in the app? G4S Support Agent May 13, 2018 12:13 Updated Follow We will only need to have your email to activate your “G4S WithU” account If you are a Cosmote subscriber and you want to benefit from special discounts, we will need to have your mobile phone number also. Related articles How can I install and use the G4S WithU app? Does G4S WithU work anywhere in the world? Comments 0 comments Article is closed for comments.