Is a divorce pronounced over the phone with the words "you are divorced, divorced, divorced" effective, despite the marriage not having been consummated and there being pictures and phone calls indicating privacy between the spouses, and is it permissible to take the wife back after this divorce?

If you were in a valid, private seclusion with your wife, then, according to the Hanbalis, she is considered to have been consummated with. Your statement to your wife, "You are divorced, divorced, divorced," is explicit. If you intended three divorces by it, then all of them have occurred, and she has become irrevocably separated from you (baynunah kubra). You cannot take her back unless she marries another husband, consummates the marriage with him, and then he divorces her or dies, and her waiting period expires. However, if you did not intend three divorces but rather intended emphasis, then it is a single divorce, and you can take her back.