I have just noticed from my usage stats that there are many internet usage "charges" going against against my data allowance when I am at home and connected to my wifi.
Why is this happening?
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as I'm sure you're aware, many Apps regularly update & it's possible that when your phone is in standby WIFI goes to sleep.
If this is the case, it would account for the usage.
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Some Apps need at the very least Background DATA (not Full DATA) to work, try disabling Data or only Background Data and use WIFI and you will see some Apps will nag you about this.
They should use a far less amount of your DATA on WIFI though.