Castiel's cell phone is a communication device used by Castiel.
In Season 5, Castiel obtains a cell phone which he uses to communicate with Sam and Dean Winchester. It is unknown where or how he got it. Until Season 9, Castiel still communicated with Sam and Dean through prayer.
In Meta Fiction, Castiel demonstrates the ability to take photographs using his cell phone. He was also able to send the photograph to Sam's laptop.
Lucifer used Castiel's cell phone during his possession of the latter.
In LOTUS and The Future, Castiel uses his cell phone's Internet connection to do research. In the former, he looks up news reports on massacres, and in the latter, he used the Internet to find out how to fix his broken down truck.
Castiel's cell phone appears to not function while in Heaven, as shown by Dean's numerous calls and Castiel's inability to receive them.
In War of the Worlds, Castiel reunites with Lucifer and learns that the Michael from the alternate reality wishes to invade their world. Castiel wants to inform Sam and Dean but Lucifer confiscates his cell phone so he can't. Soon after, the pair are imprisoned by Asmodeus, who begins using Castiel's cell phone to speak with Dean.
Castiel keeps a list of contacts of allies. Such as:
- "I don't understand. Why-why do you want me to say my name?" (99 Problems)
- "This is my voice mail. Make your... voice... a mail." (First Blood)