Sellfy Backlink

https://sellfy.com/imeidata

Go sellfy.com > signup an ccount > setup link to your profile.

Blekko Search

http://blekko.com/ws/+/view+%2Fimeidata%2Fimei

WRV Backlink

http://webraovat.com/author/anand-kumar/
WRV is Vietnamese website for free market online. But it's easy to register with english interface. Just create an account and set website to profile.

Imgur Backlink

http://imgur.com/v7ZOZ8v

Go imgur.com > Register an account > upload few image and edit caption and description then set your link here.

Eventbrite Backlink

http://imeidata.eventbrite.com/
http://checkimei.eventbrite.com/

Create an account. Confirm email and create an event. Edit your profile and setup link.

Dribble Backlink

Go dribble.com signup with your email. Go mailbox confirm email and set backlink to profile.  It's easy.

https://dribbble.com/Alos192

Backlink Free3

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http://www.host-tracker.com/InstantCheck/ResultComplete/080b7d4d-de8c-e411-80be-00155d36955e

Backlink Free2

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Backlink Free

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Backlink GOV

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PureVolume Backlink

http://www.purevolume.com/listeners/anols

Other site to set backlink on profile.
I'm going to tell people know about great site to check imei number.

Ted Backlink

https://www.ted.com/profiles/3757628

It's simple like other page. Signup > Edit Profile > Set backlink.

Use Archive to save your web to public cache

You can use archive.org to view a website hisotry. And of course you can submit your website to archive too.
https://web.archive.org/web/*/http://imeidata.net
https://web.archive.org/web/*/http://imeidata.net/iphone/unlock-check
https://web.archive.org/web/*/http://imeidata.net/iphone/model-check
https://web.archive.org/web/*/http://imeidata.net/warranty/htc

Openhub Backlink

https://www.openhub.net/accounts/imeidata

Openhub (aka ohloh.net) is accept people use their site on profile.
So just signup, put your site to profile and get good backlink.

ISSUU Backlink

https://issuu.com/cuongnguyenquang

Yes. Signup with your facebook, change profile images, name and setup some backlink.

Orchid Backlink

http://orcid.org/0000-0001-7869-4645

Just signup, confirm email and put link to profile page.