I lost my cell phone, and after 2 weeks, I feel I'm beating a dead horse.

SO,

I have my old RAZR, that I hate, and my mom wants it, and I'll take her phone. (LG VX8350)

I've switched phone numbers from phone to phone before, so I'm just going to do that again.

So what I'm asking is: I lost my VENUS, so I'm going to take my mom's phone (VX8350), and she's going to take my RAZR.

Question: Do I still have to report my phone lost?

Sorry if it's confusing, please ask if any clarification is needed.