The ETravelSim Taiwan eSIM supports 4G, LTE, and 5G across Taiwan. 5G is widely deployed in Taipei, New Taipei, Taichung, and Kaohsiung, including underground MRT stations and dense city centers. Outside major cities, your phone falls back to 4G/LTE, which still handles streaming, video calls, and Google Maps navigation without issue. The 5G difference matters most for large file uploads, HD streaming, and remote work from Taipei or Taichung cafés.