Apparently it is there for our own good, just in case something nasty gets on to the iPhone by way of a rogue App Store application. Apple can then remotely disable it, and the application you paid for, on your behalf without your permission.
Unless, that is, you kill the killswitch first.
Now before going any further it is probably wise to point out that, despite the privacy implications and all the rest of it, disabling the killswitch could have unpredictable results as far as your iPhone is concerned. If not now, then further along the line. Who knows what Apple might do with it? Also, anyone jailbreaking their iPhone always does so entirely at their own risk.
Anyway, parental lecture over and on to the class geek one instead.
Disabling the kill switch can apparently be accomplished in three simple steps:
- Jailbreak your iPhone with PwnageTool
- Install the BossPrefs 2.12b app from Cydia
- Hit the big 'neuter' button to disable the kill switch (look under "Allow Apple App Killswitch")
Congratulations, you have killed the killswitch!