Question: what is the american phone code for mobiles
[{'answer': '+ 1', 'provenance': [{'wikipedia_id': '5770', 'title': 'List of country calling codes', 'start_paragraph_id': 7, 'start_character': 32, 'end_paragraph_id': 7, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Ordered by code.\n'}]}]