Q: Haii Friends....I am unable to re-activate my iPhone-5s after updated to the latest i OS version as i forgot my Apple ID .I Know the Apple ID password and iPhone lock code. Also its reading my Finger print. Sadly 'Find My iPhone' option is Active  .

https://iforgot.apple.com/password/verify/appleid#!&section=appleid

You Apple ID is simply your email.  You can confirm this at http://appleid.apple.com

It is likely that you will continue to have issues even after you verify your sign in as mny people are experiencing an issue signing into the iPhone after updating, and Apple has reportedly been working on the issue.  Some have found the following steps helpful.

Go to iCloud.com and select Settings once you are logged in. Click on your device listed there and Remove from Account (don't hit erase or lost mode).  Restart your device and it should bypass that Activation lock screen since you effectively turned off the lock by removing the device from iCloud.com

I hope that helps!

Did you go to the link that I provided above and click on it?

Contact Apple Account security:

Contact Apple for help with Apple ID account security - Apple Support

What is your country?

I am getting a replacement phone from Verizon since the IOS 9.3 update took out my iPhone 5.

They are sending me an iPhone 5s through my insurance.

If I take it to the Apple store the next day can they unlocked the phone ?

Since I imagine it was Used before me and I won't have the original activation email.

I will have all the proper paperwork to prove how I got the phone.

Hope to avert Any Issues when I Update my replacement

phone to IOS 9.3

Is this a good way to go in your opinion ?

How did the update "take" out your phone? In any case if you are getting a replacement it will be refurbished or (sometimes) new. It will behave as out of the box (new)and you will be able to activate it with whatever Apple ID you wish.

Call the UAE or KSA number.