Final answer:
The text provided does not contain information regarding how Ishmael learned to communicate telepathically. The question likely refers to a specific literary context or story that is not included in the materials referenced.
Step-by-step explanation:
The question about how Ishmael learned to communicate telepathically is not clearly answered within the provided reference material. The majority of the text refers to historical Islamic communication, the possibilities of extraterrestrial communication through radio waves, the belief in Muhammad as a prophet, and the concept of communication and mimicry in early hominins.
None of these context excerpts directly address the specifics of Ishmael's telepathic abilities. It's likely that the question pertains to a fictional story or a specific text not referenced here, possibly requiring a literary analysis to understand how a character like Ishmael, who may be from a novel or literary work, gains the ability to communicate telepathically.