Great flynax support provided solution.

It should be done in php code, not presentation part (smarty template)

File to modify: include/classes/rlCommon.class.php

line 791:

PHP Code:
Only registered members can view the code. 
I think that regex is not perfect, it will also select 1000-2000 eur (which is not phone number) but you can modify regex as you want.