iPhone Activation Lock Help

See Turn off Activation Lock https://support.apple.com/en-us/HT201441. 

Since you acquired your device second hand form an individual, and if you can contact the prior owner, you will need to obtain the needed password from them or have them sign out of iCloud; erase the device; and remove it from their device list. Alternatively, if the prior owner has their purchase receipt for the device from an authorized Apple seller with the device’s serial number on it, then they may be able to persuade Apple support to remove the activation lock. Use the support options below. Alternatively, if an Apple Store is open in your area, they can go there to deal with the problem. In this case, they can make a genius-bar appointment (https://www.apple.com/retail/geniusbar/) if desired.

If none of the above work, then the device is useless to you.

Apple ID Support https://support.apple.com/apple-id

Apple Support Twitter  https://twitter.com/AppleSupport

Apple ID account security for country-specific andregion-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.

dean021 Said:

"iPhone Activation Lock Help: Hi, I bought a 2nd-hand iPhone 5 online, when it was delivered to me I can log in my Apple ID both Settings and AppStore, when I Factory Reset the phone, it was on Activation Lock, it needs the previous owner's Apple ID, I know the previous owner's full Apple ID but I don't know his password[...]"

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Purchased Online?

Seems like a Scam. Contact the Web site (i.e. eBay) and see if the seller can be help accountable, and if you can get your money back.

dean021 Said:

"I tried contacting the shop website but it's been already 7 days (from seller warranty and email sent to the online shop ) and still got no reply"

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Getting Support:

So, do they not assist you after 7 days? View their Terms & Conditions to find out.

What this purchased directly from the seller? Or what it purchased through a third-party (i.e. eBay)?

If they won't get back to you - that's their choice. Going it, this comes up: mail.126.com. See if that is of help.

dean021 Said:

"I purchased it through 3rd party website but the seller has its own T&Cs about ordering and receiving the product, if I open mail.126.com it was in Chinese language so I can't understand it... can Apple help me to remove the iCloud in the phone?[...]"

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I'd Go Through the Third-Party:

Whomever the Third-Party is, well, contact them. The transaction went through the Third-Party, so I'd take it up with the Third-Party, as they (the Third-Party) would have their own Terms & Conditions, for transactions.

And... No. Apple Cannot help you with logging into this. You need to take this up with the seller.