When I had my S10 on here for sale or trade I answered every call and message the day I got them.I grew up in the south and thats just how I was raised.When I post an ad I usually put my cell number in the ad so I know I'll get the call.Some people don't do that for privacy reasons but I think if you want the deal bad enough you'll post an easy number to reach you at or reply to the messages when you get them.I had some low ball offers but to those I just called back or messaged them that I wasn't interested.