The previous 0845 number used by PSNI cost 2p to 12p/min (plus 15p connection fee) from a landline and 15p to 41p/min from a mobile, depending on your provider. In a few cases, mostly BT landlines, the call counted towards inclusive call plan minutes.
Calls to the new 101 number are 15p per call, irrespective of the call length. Most of this money goes to the telecoms company running the 101 number. The police do not receive any of it.
If you don't want to pay to call the police non-emergency number and have a call plan with inclusive minutes for calling 01, 02 and 03 numbers on your landline or on your mobile simply use the alternative number listed here:
http://www.police.uk/contact/alternative-non-emergency-numbers/Correctly formatted, the number is 028 9065 0222 which can also be called as 9065 0222 from any landline within Northern Ireland.