Mail: via 3G or Wifi?

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http://androidforums.com – Hi experts, I need your help. I am presently using a Blackberry and my mails are pushed when I am connected to the phone network. I travel a lot and am trying to avoid roamimg costs. I am looking to buy the Samsung Galaxy S2 and I have opened a Gmail account. My question is: Can I set up my mails so that when I am getting Wifi, they are transferred that way. Or must I log onto the internet and use the web page (Gmail)? Hope this makes sense. Thanks Herri (General)