3G UMTS/WCDMA: B1(2100Mhz). --4G WiFi provides up to 10m range, no need to worry about no network when traveling outdoors. Modify the APN. 4G FDD: B1/B3(2100/1800). Speed is different. A2:Even if your SIM card is compatible with the product, it is not necessarily plug and play, you need to disable the SIM card PIN and modify the APN.
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