why sms not working after upgrade to w10. Lumia 1520 Denim

[WPCentral Question]

After upgrade to w10 from insider program sms stop working on my Lumia 1520 Denim.
I get messages but cannot open. When I try to open allways lumia go to previous screen

 

[pratok69]

I too experienced this. I found my access point settings were wrong. Find correct settings by asking others on your providers plan or calling provider tech support for correct settings. If you go to settings, then search for "access point" in search box, you will be able to edit. My T Mobile settings did not carry over to new install...no surprise really. Good Luck.