I have had the same mobile number since 2008. Since then I have only had ONE marketing call (if you exclude the flood from my previous network provider which made me switch away from them when they didn't stop when instructed). Two days ago I posted an ad up on Gumtree for the first time. In the two days since I have had FIVE calls on my mobile used on the ad - all from jerks who want to offer me support for "my accident I have suffered in the last 5 years." Maybe a coincidence, but I strongly doubt it - enough so as to Post this Review online so as to warn others to think carefully before allowing anyone (especially Gumtree) to have your PRIVATE mobile number. Gumtree have a system whereby you only get to see the full number if you login to the site (even as a buyer). Clearly - in my opinion - wasters who 'ambulance chase' either create login IDs to allow them to harvest mobile numbers, OR, Gumtree don't obfuscate private telephone numbers as well as they would have you believe. I had a quick peek online regarding the wisdom of placing an ad on Gumtree, including one's mobile phone number. I wish I'd done that BEFORE uploading mine on that ad!!! Clearly I am not alone. Apparently the wise way is to list the ad with ONLY a contact email address - and one that is dedicated to Gumtree as opposed to one's main email address. Hopefully this review will help anyone considering Gumtree as a place to sell something.