Question: what network does metro pcs run off of
[{'answer': 'T - Mobile', 'provenance': [{'wikipedia_id': '2661814', 'title': 'Metro by T-Mobile', 'start_paragraph_id': 25, 'start_character': 14, 'end_paragraph_id': 25, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Reception.:Marketing.\n'}]}]