No wifi after changing provider / sim card Last Monday I changed provider and got a new simcard. I can use the phone and send SMS/text messages. Internet didn't work anymore. Wifi didn't work anymore. Both have not worked since. I do see the 3G or GPRS icon in the statusbar. I see the Wifi icon, and it's connected to the right network. I've tried this on several locations. 

The provider says they have a problem since Tuesday (not Monday), so 3G does not work. What baffles me is that wifi doesn't work anymore. 

Last weekend I've tried to get a paid proxy service working on my laptop, which didn't work for some reason. I installed OpenVPN on my phone. I didn't configure the proxy service on the phone however. I removed OpenVPN yesterday to be sure. I have used internet on the phone since installing OpenVPN, so I guess that can't be the problem. 

On Twitter I read about someone using the same network who could still use Whatsapp, so I tried that, and then saw a popup "unable to resolve host ota.avatarrom.com" (or something like that - it disappeared too soon). I've installed Avatarrom several months ago, and although I have problems with it (Settings crashes on and on), it works reasonably. Whatsapp couldn't connect by the way. The phone: Samsung Galaxy S2. 

The provider can't tell when their problems are over. I'm curious if that will solve anything, we'll see. 

Can you explain this? What can I do to get Wifi working again?
I found out that disabling the AFwall+ firewall solved my problems. Now everything works. This has worked with the previous provider, and I don't understand how changing the simcard can result in this.