Can i mail my cell phone back thru blue mailbox

I think there may be some confusion here!

Blue Mailboxes are actually a service provided by FedEx, not a postal service. They are designed for sending packages, not mail. And, unfortunately, you cannot mail your cell phone back through a Blue Mailbox.

If you need to return a cell phone, you'll need to contact the manufacturer or the retailer where you purchased it to arrange for a return. They may have specific instructions on how to return the device, which may involve using a pre-paid return shipping label or dropping it off at a designated location.

If you're trying to send a package, you can use a Blue Mailbox to send it to its destination. Just make sure to follow the guidelines and restrictions set by FedEx, and ensure that your package is properly packaged and labeled.

Let me know if you have any other questions or if there's anything else I can help with!