A little-known feature in iOS 5 is the new option to create free, custom ringtones and text message alert tones.
hack wireless doorbell to play custom ringtones
Creating Custom Ringtones For iPhone
How to Add Custom Ringtones to a Wireless Doorbell by DIYHacksAndHowTos
Nike bling shoes Fashion Pegasus Swarovski Nikes by AllureDesignz
How to Add Custom Ringtones to a Wireless Doorbell, well if life get's a little boring it might make the postie smile.
Most doorbells just make a simple generic tone. But I thought that it would be fun to modify a door bell so that it has a customizable ringtone.
MakeUseOf: How To Create & Install Custom Ringtones On Android Phones