I have an iphone 4 on 4.0.1 FW. All i want is to get mywi on my phone. i have no interest in any other stuff involved with JB. I've jailbroken plenty of phones, and my own in the past, and dont find much about it appealing. I NEED stabilty. I dont like weird stuff happening randomly, or crazy battery drain. I read something about a "mobile substrate" going haywire and and draining batteries like no ones business. Some changed the mobile substrate and it helped or whatever. All i want to know is: Can i use Jailbreakme or similar, JUST for mywi, nothing else, and have a stable phone as i do now, no weirdness, and no battery problems? thanks!