Jagex Phone Number - Customer Support for Runescape

If you want to know the Jagex phone number, it is actually on their website at http://www.jagex.com/corporate/Contact/contact.ws. You should note that their number is not for customer support.
 

+44 (0)844 500 6699. Please note: This number is not for Customer Support calls. 

So basically, this is useless if you want to talk about your banned account or any other Runescape-related customer service details - except for billing support. You can email Jagex at billingsupport@jagex.com.

Jagex phone number