The inclusion or exclusion of the 101 number from mobile phone plans is a decision made by individual telecom providers. Mobile phone customers can adjust their mobile phone settings, so they can ‘opt in’ to chargeable calls and use the 101 number. It is for telecom providers to provide this information to their customers in their plans.
The Home Office is removing charges for the 101 police non-emergency number, making the number free of charge for all members of the public from April 2020. The Policy for this sits with the Home Office.