Should I buy a follow WiFi or a used 5G phone as a hotspot?

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I got lost after searching for a few portable Wi-Fi devices with an IoT card reader, which all claimed to be fast but were actually just scams! I also tried various刷机和改机的方法，但不知道谁是靠谱的或者速度如何。如果买一台二手带破损5G手机当热点使用，也不错吗？该如何选择呢？