My phone is a Galaxy ACE GT-S5830M (baseband S5830MWHMJ1) with Android 2.3.6 (rooted)
It's driving me crazy. As is well known, there is no way to stop some Google apps like Google plus from updating themselves when there is an Internet Connection. Unfortunately this maxes out my available Memory as this app cannot be moved to the sd. The difference between the Basic app and the all updated app is about 20 MB and when fully updated my Galaxy ACE even refuses to accept incoming Messages. So I used to Switch Wifi off when not needed, uninstall the Google+ updates and my phone worked nicely.
Today I changed the mobile Provider to Vodafone and since then WIfi turns on all the time. I switch it off and a few seconds later it is switched on again, connected to the Wifi of my router. I switched off the network notification of the phone, but it does not changed anything. I looked for the connection optimizer that has been mentioned but there is none. Seems to be special on Sprint phones. Mine is not from any provider.
I was even thinking of turning of the Wifi of my router, but there is other people connected to it. I could kill this entry in the phone's list of known wifi networks, but then using it if needed becomes cumbersome as I would have to enter the long password everytime. As an aside, it would simply connected to one of the other two Wifi channels that we have.
OTOH I never had this problem before, something appears to have changed when I put in the Vodafone simcard. I have restarted the phone but to no avail.
I hope someone can help.