Yes, you really should have one if you plan to engage in this hobby. They do it just for security. Many (though not all) are very paranoid about LE. By not giving you the location until the last minute, if you are LE, it does not give you time to set up anything at her location in terms of support/backup. If she smells something funny, she can bail without being trapped. There are those who do not require the last-minute call, however, so, if you really don't plan on getting a cell phone, look specifically for those--but be prepared to pay more, as they are generally the high-end providers.