Can't pair my iPhone 4 and HTC Evo?

I've been trying to pair my devices together using Bluetooth to move some songs over to my iPhone 4, but even though they are both discoverable, when I try to search, neither device names show on either phone. Can I not pair these two devices to transfer music? If not, how can I transfer music from one device to the other?

Technically, you are not suppoed to be able to do that because the music on the HTC was not purchased from iTunes but there's a bit of a loophole.

Transfer the songs from your HTC to your computer. Add the songs to your iTunes library, create a playlist full of the songs that you want on the iphone and then sync it.

Apples money spinner is iTunes

HENCE WHY All IPHONES WILL NEVER EVER, EVER, EVER EVER HAVE
1) MICROSD EXPANSION
2) BLUETOOTH

I'm surprised by you question as I though everybody knew that iPhone did NOT have Bluetooth

But here is the unaccepted and unofficial reasons
re 1) microSD allow you to move media by taking a memory card from one one and inserting it in another, so if you sell something it and don't want it moved yada yada yada

re 1) Bluetooth allow you to move media by pairing 2 phones and Bluetooth from one one and, so if you sell something it and don't want it moved yada yada yada

The ONLY profile on an iPhone is a HSP head Set Profile to connect a bluetooth device nothing can be exchanged, so if one of the phone is an iPhone, no exchanges via Bluetooth even you own Business card with contact detail, diary event

NO DATA TRANSFER MUSIC / JPEG / VIDEO VIA BLUETOOTH SEND OR RECEIVE, all music synced via iTunes run out of space you have to buy a whole new phone which (being Apple is very expensive) is better than selling a memory card

Your EVO will pair with any another phone, iPhones pair with nothing