I believe the phone is smart enough. When the wifi is on the 3G connection looks to go to sleep. I've never shut the mobile network down on my phone and lately I'm going about 2 days before needing to charge the phone with moderate usage. I have my wifi connection set to never sleep and I only toggle that off when I'm not going to be near wifi for a few hours. I also leave the GPS on. I really don't bother toggling any thing off anymore.
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