Question: who is the giffgaff mobile network run by
[{'answer': "O2 's owners Telefónica", 'provenance': [{'wikipedia_id': '24473241', 'title': 'Giffgaff', 'start_paragraph_id': 1, 'start_character': 150, 'end_paragraph_id': 1, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24473241', 'title': 'Giffgaff', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 215, 'bleu_score': 0.7423103725116, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3530404660211338289}, 'section': 'Section::::Abstract.'}]}]