Not free calls but cheaper

From Horsham, 1 post

dependant on your tariff you can call Cross network for just 10 P/Min at all times.

Also you can call from Landlines for just 10 P/Min at all times.

Dial 0871 208 1000 wait for dial tone then dial the mobile number. Calls form contract mobiles and BT lines cost 10 P/Min , on ALL OTHER MOBILES CHECK with your service provider what they charge for 0871 calls