Source: https://www.proximus.be/dam/jcr:84da2c1f-7d97-4b34-8821-aa30c4b24d8d/cdn/sites/iportal/documents/pdfs/common/from20191101/Conditions-particuli-res---T-l-phonie-mobile---FR~2020-07-01-06-20-44~cache.pdf