Hi ​@Grumik, I would love to look into this for you and see what the reason is that you can't link your phone number. I cannot find a mobile phone contract that is on your name on the same address. Please note that all the data like name, address and date of birth need to be the exact same for both the contracts for them to be able to be linked to each other. Could you please add the phone number that you want to link to your profile in the space that says “Info voor moderator”? Once you have done this, you can let me know in this topic and I will check everything for you! 

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and thanks in advance!