Question: which network does virgin mobile use in south africa
[{'answer': 'all networks', 'provenance': [{'wikipedia_id': '12091684', 'title': 'Virgin Mobile South Africa', 'start_paragraph_id': 4, 'start_character': 158, 'end_paragraph_id': 4, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Services.:Voice & SMS.\n'}]}, {'provenance': [{'wikipedia_id': '12091684', 'title': 'Virgin Mobile South Africa', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 359, 'bleu_score': 0.7944090879280881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16676019203069831317}, 'section': 'Section::::Services.:Voice & SMS.\n'}]}]