What is Proximus M-Pay? CSMgr.8686 Updated March 28, 2017 19:39 Follow M-Pay is a free service offered on Proximus network by Belgacom in Belgium that allows users to pay digital purchases with their mobile phone. Visit Proximus support website for more information. Related articles How do I know if I have a M-Pay account? How do I configure my M-Pay account? Why am I redirected my mobile / internet provider when I try to make a purchase with Boku? I got a message that said: "Sorry, your payment failed. No charges were made." I haven’t received a PIN to log into the Customer Care Portal Comments 0 comments Article is closed for comments.