Who is this phantom backlink you are talking about pointing to? We can look in the code of the tumblr page you linked to and try to see where it is linking out to the site your talking about.

google shows backlinks for sometime even after it has been removed.

could be old data

Well HostMafia is right - backlink reporting tools may display a site's backlinks even after those links are removed, so that could be the case here. However, if you'd like, you can give us the link you are talking about and we can look at the code on the Tumblr page to see what's up.

what should i do for getting backlinks ? I have mobile phone related website and wish more and more traffic from relevant sources. Please also refer me if some on is giving ther services of SEO .

I have also found some tools giving old backlink data, does anyone know of one that is up to date ?