Question: what was t-mobile called before it was t-mobile
[{'answer': 'VoiceStream Wireless PCS', 'provenance': [{'wikipedia_id': '20563054', 'title': 'T-Mobile US', 'start_paragraph_id': 4, 'start_character': 58, 'end_paragraph_id': 4, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '20563054', 'title': 'T-Mobile US', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 431, 'bleu_score': 0.9735040436119741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 109849846923299534}, 'section': 'Section::::History.\n'}]}]