Windows 10: Windows Phone connected to WiFi no SIM but won't load anything

I own a Windows Phone Windows 8.1, I think.... I'm currently without a SIM card, but I need it to access the web. I tried connecting to my home WiFi, and it said it was connected, but when trying to open anything online, I get an error that says that it can't find the server or there is a DNS error. I tried turning it on and off, taking it on and off aeroplane mode, and connecting to WiFi whilst on aeroplane mode. I would greatly appreciate any advice.

:)

 

Windows Lumia 930 won,t connect to the wifi.

l have windows nokia Lumia 930 and it won,t connect to wifi at home or at work

 

Phone won't connect if I change wifi password

I've finally figured out what happened, but the problem is only temporarily solved.

I had changed my wifi password. And the phone won't connect with the new password. If I change the wifi password back to the old one it connects.

So it's definitely a phone issue.
I wish I could change my wifi password and have my phone working..

 

Phone won't connect if I change wifi password

My Nokia Lumia 520 never had any connection problems, but today it won't connect not even when I press the WPS button on the modem or type the wifi password. I get the message:

''The Wifi network didn't respond, try again later''.

Wifi is working fine on all other devices (pc, laptop, tablet and other phones) so I'm guessing it's a phone issue? Phone's wifi was working fine yesterday.