Question: where do cell phone unlock codes come from
[{'answer': 'mobile phone manufacturers', 'provenance': [{'wikipedia_id': '210476', 'title': 'SIM lock', 'start_paragraph_id': 1, 'start_character': 141, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '210476', 'title': 'SIM lock', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 390, 'bleu_score': 0.9155272930874561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1067472713882751839}, 'section': 'Section::::Abstract.'}]}]