A simple “Hi fancy a chat” or “Hi I’m Sally, my number is 0125454125 call me” gives the reader no information about me and doesn’t suggest in any way that I would be fun to communicate with.
Similarly, telling someone your life story in an opening message will put them to sleep.
What is needed is something that stands out from the crowd.
Read my post about good dating headings to improve your chances of getting your messages read.
Laughter is a great way to get someone’s attention, so try to include something to make them laugh but remember jokes don’t sound the same in written type as they do in your head, so add a laughing smiley to ensure they know you are joking.