iPhone Only, support iOS7 to iOS8.1
Only3G is a add-on of flipswitch and flip Control Center for iPhone to be locked on 3G only.
Looking for 4G? Checkout my another tweak: Lock4GLTE
Note:
If you purchased & Installed Lock4GLTE, Turn it off before turn on Only3G
Again Special thanks to @Hirakujira for helping of API and support
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