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