Why can't I browse store, internet etc., when my Lumia 630 is connected to wi-fi?

[Windows Central Question]

I can't browse the internet or the store when I connect to wi-fi.
The internet browser gives "Refresh or try again later" message, and the store gives "Problems with connection, try again later" message.
The wi-fi status says connected. (Sometimes it's limited, but either way, it still doesn't work)
I tried:
- turning the wi-fi on/off,
- changing setting on my router (the channel from auto to six and b/n/g to just g)
- resetting the router
- resetting the phone to factory settings
- removing the battery (that worked just once for just five minutes)
Also, I have only one sim inserted. (I don't think it matters, but who knows.)

My other phone and computers do connect to the wi-fi network just fine. (I.e. I can browse the net)

Any other ways to try to fix it?

Or, is there a way to install apps without logging in to MS account?
(Because I really only need the wifi to log into the MS account to install one app I have already downloaded to my SD card)

Thanks for help in advance.

 

[CosmicPoweR]

It can be the router problem. What router or firmware you using? This case similar to what having here: http://forums.windowscentral.com/nokia-lumia-1520/255379-wifi-issues.html.

Reset the router 30/30/30. Change to g only, 2.4ghz, 20mhz and change the channel to 6 or 11. Hope this help.