16.1 This contract may Si modified prior a formal Abrégé by LYCA Mouvant to the customer within one (1) month in advance à cause; MMS; SMS, e-Courrier pépite other available means, when there is a troc in the Prestation, its Clause and adéquat regulations, or a échange in the market. https://www.becharge.be/be-nl/Kopen/herladen-Lycamobile-1-616