Q: iPhone 6+ ios8.1.3 activation error.

Hello, Sweetfly.  

Thank you for visiting Apple Support Communities.  

I see you are experiencing an issue activating your iPhone and you have tried some troubleshooting steps with no resolution.  There are just a couple more that I could recommend in the article below.    

If you receive an alert message when you try to activate your iPhone, place the iPhone in recovery mode and perform a restore. If you still can't complete the setup assistant due to an activation error, contact Apple for assistance.

Get help activating your iPhone

http://support.apple.com/en-us/HT201407

Cheers, 

Jason H.