A jitter bug phone is a cell phone designed for seniors or people with sight or hearing problems because it has bigger font and louder sounds. I wouldn't recommend this phone for a friend even though its very cheap.
It is correct if it is what you intend to say. If you mean that your friend heard something, and then related it to you, you can say that it was heard by a friend. Your friend heard it. If you mean that YOU heard something, and you heard it because your friend told you, then you heard it from a friend.
The present tense of "heard" is "hear."
"Hear/hears" is the present tense of "heard".
Yes, "heard" is the past participle form of "hear" and is used in the present perfect tense. For example, "I have heard the news."
John Heard was born on March 7, 1945.
Amber Heard was born on April 22, 1986.
It was obtainable on his birthday from what I heard.
The past tense of "hear" is "heard" and the past participle is also "heard."
If a friend of yours is called that, sure. Though I never heard of that name. I only heard of Mackenzie. This answer is kind of variable.
I heard that Shane Sheckler's birthday is May 1, 1991.
They probably heard a rumor about Sora's birthday.
The present perfect tense for "you heard a strange story" is "you have heard a strange story."