Kindly read the description carefully and don't forget to&nbsp; examine the mentioned application before you reply.<br/>To implement this application developer must need&nbsp; experience in iphone development Ruby script/MAC OS X/perl programming since these are the part of the application requirement to give application below mentioned functionality by keeping in mind that required functionality doesn’t comes with apple official API.<br/>Apple API doesn’t allows multitasking and doesn’t allows you to read the caller ID buffer as a call arrives neither to read the incoming call history log file, the developer will have to come up with a solution for that.<br/>I know this is something can be done since there are applications outside (see below) have the above mentioned capabilities (multitasking + reading the incoming caller ID buffer as a call arrives). Below is a list of application implemented exactly the functionality I’m looking for my application as they know how to read the incoming caller ID buffer as a call arrives and do an operation in conjunction to the OS, means multitasking.&nbsp;<br/>McallShow – this application is sort of Caller ID which have the exact capabilities we need for our application to fully function. This application read the caller ID buffer as a call arrives and then send a query to the database.<br/>http://iphonefreakz.com/2008/11/19/cydia-mcallshow-12/<br/>iBlacklist – this application must access the incoming call/text history log file and also to have multitasking and to be able to read the incoming caller ID buffer in order to function.<br/>http://www.iblacklist.com.br/iblacklist/index.php<br/>To read full details about the way it works:<br/>http://www.appleiphoneschool.com/2008/06/16/iblacklist-191-filter-incoming-calls -and-texts/<br/><br/>Mcleaner – same application as the above mentioned.<br/>http://iphonefreakz.com/2008/06/03/mcleaner-14rc1/<br/>Backgrounder - Lets you multitask on the iphone.<br/>http://code.google.com/p/iphone-backgrounder/wiki/Documentation