Q: unable to activate my phone after upgrading - saying incorrect id and password

i have same problem i have iphone 5 i cant activate saying incorreci id and pasword

If you bought the phone second hand then you have run into the Activation Lock -

Find My iPhone Activation Lock - Apple Support

If you are the original owner - bring the phone into Apple or an authorized center with the original document of purchase and they may be able to assist

I'm having a somewhat similar problem after doing the iOS 9.3 upgrade on my iPhone 4s - after entering Apple ID & password I get "Activation error -unable to complete activation" message. So my iPhone is totally useless currently - never gets past activation.  I've spent 5 hours with Apple technical support and with local Apple store technician who all say they've never seen this specific activation problem before, although one support tech did say are seeing getting many calls about 9.3 upgrade problems with the 4s.   The store technican diagnosed that for some reason (if I understood her correctly)  instead of just going to the activation server (for AT&T, my carrier) it also going to a second activation server, which it is not supposed to do and then does not pass or is hanging on it.  They are in agreement that it is software problem/bug in the 9.3 upgrade, not a hardware problem with my iPhone.  As part of trying to figure out what was going on, I had to do many power off resets and ultimately completely erase the iPhone and reload the 9.3 update (several times) - which still did not work.  So it looks like the 9.3 upgrade changed something in the iPhone that even a "reset to factory original mode" will not undo.

Here's the fix options as suggested by Apple (as of 3 hours ago)

(1) Apple store technician submitted a special activation request work order to do the correct activation process, but I have to wait 24 hours for it to go through - if it works, my phone should be OK..

    << I selected this this now.  So no working iPhone in the meantime.

(2) wait for Apple to issue a new iOS software release with fix for the problem

    --- did not select this, as have no way of knowing when a release would come out. Could be today or 6 weeks from now.

(3) buy a new iPhone

    >>> This is the most objectionable option and not selected.  It is not my fault that the iOS upgrade killed my phone, all I dd was say yes to the upgrade.  I'm not keen on spending somewhere between $400 to $800 dollars on a new phone for Apple's problem.  My view is that if Apple cannot fix the upgrade software issue quickly, I should at least be swapped for a equivalent iPhone at no charge.