Even if you already own land, you can opt in for this service for free. Survey number mismatch is the most common problem of the lands in Telangana. It's a situation where your document shows your ownership in a particular survey number. However, your physical possession (or a part of it), is in another survey number. Throughout the last few decades, transactions have happened without people paying much attention to the problem of survey number mismatch. However, it seriously affects the prospects of a further sale and it would be best to do a check and find out if your land has this problem, so you can act on it accordingly. .