Question: when did the first portable phone come out
[{'answer': '1924', 'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 5, 'start_character': 501, 'end_paragraph_id': 5, 'end_character': 505, 'bleu_score': 1.0, 'section': 'Section::::Predecessors.\n'}]}, {'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 848, 'bleu_score': 0.959893969644335, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17514943878690289666}, 'section': 'Section::::Predecessors.\n'}]}]