Final answer:
The phrase in the options is 'On my cell phone.'
Step-by-step explanation:
A phrase is a group of words that conveys a single idea but does not have a subject-verb relationship. In the given options, the phrase is On my cell phone. It functions as a prepositional phrase and describes where an action may have taken place. The other options are comprised of complete sentences or clauses, which include a subject and a verb.
Learn more about Identifying a phrase in a sentence