Why my iphone tend to lose Wi-Fi signal?

I use iphone 3gs ios 5.1.1 and i realize sometimes when i'm connect with Wi-Fi, it tend to lose its signal… Then i need to go to setting and click my Wi-Fi again… Sometimes its not like that, but sometimes it does. If it is because my internet, why i don't have any problems connecting with my laptop?

p.s. Don't tell me that i need to get closer to the router or something similar like that… Cuz i wasn't moving and i'm not an idiot! (-.-' ) besides if i'm not near the router, i wouldnt be able to connect from the first place…

I've had similar problems before. What I did was to turn off the 3G and cellular data options on the settings--->network menu. This way, your device runs fully on Wi-Fi and there aren't any interruptions from your 3G and network data. Try to visit http://www.dailyflux.com/ for more technology news and trouble shooting tips.

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