My Macbook (lion/ML) can connect to wifi, but gets no internet (only specific network)

Hi everyone.
I'm really not the only one having a Wi-Fi problem, but my case may be a little different, so I thought I'd start a new thread.
I can connect to my Business network, To my home network and to my mobile phone tether connection. All gives 3/3 or 2/3 bars (perfect connection) but only my phone tether connection actually gives internet through. Strangest thing is that all of this happened suddenly. I had a few weeks of perfect internet (I only have this laptop for a few weeks) and suddenly all my Wifi is not working correctly
My configuration:
Macbook Pro 15" 2012, non retina
Mountain Lion, with all updates installed (also happened on Lion)
WiFi connection
KPN ZTE 220H Modem/Router
A few things to keep in mind:
- This problem started on Lion, but after updating to ML, it hasn't been resolved
- I can connect with any router
- But can get only Internet from one specific network (My Phone tether)
- My home network and the network at my office can be connected, but doesn't gives any internet, nor Ping (terminal) does work
- Ethernet works perfectly
I'm not running a 169.*.*.* DHCP
Ok, besides that.. I've tried quite much any solution.
- Renewing DHCP Lease
- Resetting the PRAM
- Resetting the SMC
- Network Assistent
- Network location options
- Removing all Network devices, applying and readding them
- Removing the system preferences, clean the bin, reboot
- Use a custom DHCP, BootP
Non of all those options work to resolve my Wi-Fi problem. Not even for half a minute.
Anyone else has a solution?

Hi; Then this has got to be the lamest Flatypus (Ozzie roadkill laptop), Mate. Drive on: nothing to see, here. Just Pretty; only. Shiny, too; NOT EVEN. Yes there are 12-page forum threads here and elsewhere on the Mac dropping wireless, an issue that must disappear soon (got Mac OS 10.5.6?). The best and brightest Mac programmers are working as we speak, trying to dig out an end-around for the hundreds of dorky ancient pc MS-DOS router scripts, without destroying the magic for Mac-native devices by being encumbered with dross protocols, dumbed down.
So, have heart; murmur not. Cowboy up, which is American for 'spend more money on the issue' (and, d'oh, spend it on the same people that brought the issue to you in the first instance ...) ... buy a Mac Airport Extreme Base station? Else just keep trying to configure the existing Router; sweet, when you finally troubleshoot this dud and post back ...
Is your router capable of wiFi "n" even ... may be time for an upgrade, then; something new, and Mac-friendly. Good luck!

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