I own domain.plzhost.com which is domain apprasial service. With that being said I will give you an appriasal for free.
Based on the fact that page rank does not exist
There are no links pointing to it
Since there are no links back to it it will not be ranked well in google
If you type in instant unlocking it comes up by any of the words by themselfs it will not come up in any of the first 4 pages.
In yahoo under key works your site is not in the top 1000 for the following key words which are also in the meta tags
Mobile Phone Unlocking[FONT=verdana,geneva,lucida,'lucida grande',arial,helvetica,sans-serif]
Under MSN and Ask.com its not ranked in the top 1000 for the following key words which again are all your meta tag key words
Mobile Phone Unlocking
Nokia Unlocking Simfree
Based on the fact that its not doing to good in terms of keywords if I was going to by the domain I would expect with template and all $40-$50 only.
If you could get it ranked and optomized good that would raise the valuse of the domain up. Links back to your site are good. You want to focus on all the search engines but good is the most important.