same problem! iphone 3GS 32GB. jailbroken with Blackra1n. i dont have the camera sign i called the mobile phone operator (Zain Bahrain) & they gave me the cellular data settings (internet & mms) but still dont have the camera icon
If you're on AT&T or a normal provider the camera app should be included in a carrier update via iTunes. If you're on another carrier you'll have to download carrier bundles though Cydia to activate the MMS.