How to top up a prepaid SIM card? Your SIM card can be topped up par your account by clicking nous-mêmes the red button 'Top up SIM card' (displayed at the top of each Écrit) or à cause 'Top-up' in the app. Usages one of the following methods to top-up: https://www.becharge.be/be-nl/Kopen/geschenkkaarten-Amazonde-3-254