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