This post will show you how to turn off app auto update on iphone.

if you have a limited data plan then you might want to do this as the updates tend to eat all your data allowance.

to disable the app auto updates:

goto settings > itunes & app store

scroll down to ‘automatic downloads’

to disable the app auto updates all-together, toggle the ‘updates’ switch to off

to keep auto updates on, but restricted to wifi-only, keep the ‘updates’ switch on, but toggle the ‘use cellular data’ switch to off.