Hi. I'm looking for a phone for my association. It will be used exclusively for sending text messages to all the members, roughly 500. The association does not want to buy a new phone and the second hand ones I've come across are nokia 6210, 3310 and 6110. Will any of these do the job? The nokia site says that the 3310 will do group messages to the 250 contacts on the sim card. Does this imply that there is no phone book on the phone itself?