A method for preventing overload and blocking of a mobile network when sending of alert messages to a plurality of mobile phone users located in a specific geographical area, independently of any user preferences on mobile phones, wherein the method is performed in an optimizing message distribution component (A-SMSC) connected to the mobile network, has an alert initiating message receiving step of receiving an alert initiation message having information about content of the message and where the message is to be sent, represented as relevant cells, performed as a request from an LBAS Server to A-SMSC, and information about the relevant cells is determined by a LBAS GT by converting information of a specific geographical area to corresponding cell ids.