Yes, I call to save any potential liability. I take detailed photos after utilities are marked for future reference. Once I know an area is clear, I only have an area remarked in the future if I know I am getting close to the areas shown in the photos. There is no charge.

I did (and didn't). One of my first plantings was of a key lime and while digging I found the telephone line. I immediately stopped and called 811. After they marked the yard for me, I found I was also digging directly over the power cable. I grabbed my camera and took several pictures of all the lines from different angles.