Security question; Alias cell phone and second email

I use the Google Voice phone number all of the time. When retailers ask for my phone number I give them that one. You know they probably share those numbers with other companies or maybe even sell them. Why else would they want your phone number?

why would you ever want to have another phone number?

as for email addresses i have 5 email addresses. yes, it is a great idea to have more than one email address. use one for personal and the others for when you deal with internet stuff.
yahoo, gmail, lycos, aol, hotmail, live, gmx
lots of free sites.

An option for your phone is Google Voice. You can configure it to disallow anonymous callers (those with no caller ID), have people you don't know announce themselves and other options. Just forward the Google Voice number to your current cell number and only give out the GV number.

Good suggestions above...another option is a one time disposable email address/account. free.

Mailinator...HERE

I have four emails. One for business, one for purchases and the other two for other reasons. All easily managed by my one smartphone and iPad, and MacBook Pro. You could get a google phone number for free if you wanted. Why a 2nd phone account? A little more info would help us help you.

Don't know any reason to have a second cell phone. For email yes, there are hundreds of places out there. A couple of the top ones are Gmail, Outlook, Yahoo,etc.