Problems with my new phone (wi-fi, all cell reception keep dropping out)

I recently brought my apple iPhone 3GS (last 2 weeks) and pretty much since day 1 I've the same problem. The phone network I have keeps dropping out for no reason at all, wi-fi connection too (I maintain little or no coverage, but as I've taken the sim card back to the company for inspection, they've said the sim is fine and I shouldnt be having this problem) any ideas on how to resolve this issue???

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I'm afraid i'm not familiar with mHotspot but it sounds like it's not providing correct DNS settings over DHCP and that you need to enter them manually in the phone. You can do this under Settings -> WiFi -> [tap and hold the network] -> Modify network -> Show advanced options -> IP settings -> Static. But for information on what settings you should use you need to check with the support for mHotspot. I suspect you should either use the DNS from your ISP or enter the IP of the virtual interface created my mHotspot.
 - Official Sony Xperia Support Staff
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