Phones are used for communication and are often metaphors for this concept when found in our dreams. The exact nature of the communication meant by the phone will certainly be dependent upon the context, but they can frequently speak of communication with God. This symbol may also be indicative of a "calling" that God is placing upon the dreamer. The type of phone and what is being said or done with it will also have significant impact upon the meaning of this symbol.
* Symbol meanings provided by www.mydreamstories.com should not be used as a dream dictionary. They are for reference only and both dreamer and interpreter should be careful to listen to the voice of Holy Spirit as to what any particular symbol means in any specific dream.