Given the task definition and input, reply with output. You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.

Sentence: He borrowed his mother's phone and taped it to the handle bars of his tricycle so he could call home. 
Question: Why did Jack borrow his mother's phone?

So he could call home.