How do I make my cell phone malfunction and make it look like a manufacturer malfunction?

I am on my third phone of the same model that i absolutely hate, it blinks on and off but i can't get it to do it when i bring it to the store so they won't give me the free replacement that i am entitled to. What can i do to my phone so that it wont work correctly or at all? Obviously besides submerging it, it has water detector on the phone, but not on the battery. Please help! I'm sick of being screwed around by this stupid company!

Go to Telephone Repair School, get a degree, screw with your phone and get a new one.