As your phone is one with an advanced Symbian operating system, there are number of applications available in the Ovi Store which will help you block calls among other things such as filtering, redirecting or simply restricted to blocking. Most of these applications are free to use because of their complexity and the developers who choose to release them this way. Of course there are paid applications but will do nothing in addition to these free ones. I order to obtain a call blocked for you mobile phone, please connect it to the local managing application called Nokia PC Suite and access the store from that location or simply visit the following lead and choose one which fits your interests.