Question

I wanna develop an addon (basically a hack) for IPhone native phone app. My entire idea is to provide a “delete” button on navigation bar of the phone app. When user clicks on that delete button I wanna allow to delete the call records from the mobile app itself (where APPLE does not allow this). This kind of hack (known as Recent Delete) already available in Cydia store. But I wanna know how to develop this kind of hacks.

Answer 1

Proper iPhone app hacks are usually built with MobileSubstrate (MS).

MS allows one to inject 3rd-party libraries into any apps, and replace (hook) any C functions or ObjC methods in it.

In order to write a MS extension effectively you need tools like

• nm to list the symbols,
• otool -o or class-dump-z to extract the ObjC interfaces,
• otool -tvV, ravel-arm, or IDA Pro for disassembly,
• gdb or cycript for runtime debugging,
• ldid for pseudo-signing, gcc for compiling, etc.