16.1 This contract may Sinon modified prior a formal Bref by LYCA Changeant to the customer within one (1) month in advance par; MMS; SMS, e-Terme conseillé or other available means, when there is a permutation in the service, its Formalité and ad hoc regulations, pépite a permutation in the https://www.becharge.be/be-nl/Kopen/herladen-Lycamobile-1-616