The e-mails, often forwarded by friends, vary in wording, but the underlying message is always ominous: Soon, all cell phone numbers will be made public to telemarketing firms. That means, according to one version, that "your cell phone may start ringing off the hook with telemarketers" and your precious, limited cell phone minutes will be eaten up with calls you don't want.It's not clear where the e-mails originated, but industry and government officials say they are an urban myth; they are not true. There is no list of cell phone numbers being turned over to telemarketers, and telemarketers are barred from calling cell phone numbers.