How to fix background wifi data usage in iphone6 iOS 8.1.1 when connecting to wifi?

How to fix background wifi data usage in iphone6 iOS 8.1.1 when connecting to wifi?

Hi
I have Iphne 4s/5.0.1 and I'm also stuck with same problem from last 5 days. I have restored/backup/updated the phone as many times as possible. I have been with Vodafone Customer Care (India) and now everyone knows my problem there, but there is no solution.
I have read and tried most of the solutions provided here. Please help me out.
Problem -
1. 3G / Edge working when restore as new phone
2. 3G / Edge stops working as soon as backup is restored
3. Copied and verified both of the files (8218978e4ab0a48035bb92653145a6be872ea858 (Restored new iphone & Restored backup iphone) have different settings. Replacing part of this file or even complete text of this file, changes the date/time stamp of file and on backup restoration it says "Corrupt backup" and phone restarts.
4. I dont want to Jailbreak the phone
5. Using any third party software to install new APN says "Only One APN can be installed"
6. Profile doesnt show any other APN
Is there any other way to delete this file (com.apple.managedCarrier.plist) or just change the section where in string value is "Portalnmms" to required value "iphone" along with key?
Please help me out.
thanks

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