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Sep
22
comment How much does Android use Wi-Fi for network discovery when not connected?
Once connected to a WiFi the phone will only scan manually, if you hit refresh, choose to view other wireless connections or use an app such as WiFi Analyzer that force the phone to scan. It's been reported that if you have a strong stable connection it is better to have WiFi enabled for your battery. However once out of range you should disable the WiFi. As @BryanDenny stated, the phone will drain faster while actively searching for a wireless network. If it's enabled and you aren't connected it will continue to actively scan.
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answered Contacts Sync problems: phone contacts not syncing to Google
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