wifi on smartphone

[narmada]

Please humour me here, newbie to the world of wifi and these complicated phones.
Have a Samsung galaxy 2. If i have wifi at home and have set up phone to recognise and use our router thing, will phone know to use wifi service when available or will it always default to using mobilenetwork e.g.t mobile or whatever?
Thanks in advance

When i use internet on smartphone i mean.

Are you going to leave the wifi seting on on the smartphone? If so, it'll pick it up when you're at home, but not when you're out. It should remember your password as well.

Wouldn't recommend leaving it turned on though, just turn it on and offi wth use.

Oh thanks so much for that quick response . i can mumsnet at will then!

Is there a particular reason to turn it off and on 5inthebed? I only ask as I leave my blackberry set to default to wifi all the time so wouldn't want to carry on if a good reason not to. I've only set it up to the wifi at home but didn't realise leaving it on could be a problem.

Was also wondering same. is it something to do with security or viruses or something? Speaking of which should i have anti virus software on my phone?

Minor security risk, but leaving wifi enabled after I leave home sucks the battery down faster (does on my blackberry anyway)

Is it just if you connect to another wifi source that it's a security risk? If so does that still apply with Blackberry and their (pain in the arse) bloody set of passwords you have to meander through before you can access a particular wifi source or bluetooth? Drives me crackers to be honest!
Maybe I should start turning it off. Just not sure I'd remember to turn it back on!

There's an article here - it's a bit dramatic, but highlights some vague risks. I was thinking more with my tinfoil hat. (just because you're paranoid...)

I also step my normal mobile connection down to 2G most of the time as it's fine for calls and BB email and saves battery (not sure if the 2G is generally less power draining or if it's the crappy voda network that flaps continuously between 2G/EDGE/GPRS/3G.

Moe for the battery, so the phone will keep searching for a network to connect to.

*more

Thankyou both.

The Guardian article doesn't worry me as I have to enter my password to connect to a particular wifi network so it doesn't connect to any other wifi source but mine.

I must admit it needs charging every 36 hours. It was even worse until I replaced the battery.