How would I block out my number if I am calling someone with caller id? I have a personal cell phone and sometimes when I get a page at work when I am driving somewhere I use it to call a parent because I have a ton of free minutes and it’s not a big deal to use them that way. However I don’t want the parents to have my cell number though since it is personal. They can call my desk and page me all they want… but I have had parents call me on weekends and after hours on my old cell and I don’t want this again. I don't want my number to get out… so how do I block it?