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Hello @Per.Mandt, have a warm welcome to the Fitbit Community, it's great to have you on board. 
At this moment it's not possible to remove or delete information already recorded in your Fitbit account, whether is from the tracker itself of from MobileTrack (which uses the iPhone information). I understand this is not ideal for you, which is why I would like to encourage you to submit your insight as a suggested idea, where our members can comment and vote for it so it can be implemented in the future. This is the best way to make your voice heard and get the attention from our development team.
I hope this can be helpful, if there's anything else I can do for you, please feel free to reply. 
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