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1. Before purchasing, you can check the frequency band in the link below to confirm if it meets local usage requirements

https://www.frequencycheck.com/countries

2. The frequency band used by the local country can be found in the following link

https://www.gsmarena.com/network-bands.php3?

3. Frequency band query link used by local country operators

http://en.wikipedia.org/wiki/List_of_LTE_networks

EAU Version Working Band For China, Europe, Middle East and Africa, Asia, Malaysia, Singapore, Thailand, Indonesia, Korea,

5G：n1/n3/n5/n7/n8/n20/n28/n38/n40/n41/n77/n78

4G：B1/B3/B5/B7/B8/B20/B28/B38/B40/B41/B42*/B43*

3G：B1/B2/B5/B8

LAM Version Working Band For Mexico, Latin America

5G: n2/n5/n28/n66/n78

4G: B2/B4/B5/B7/B8/B28/B42*/B43*/B66

3G: B1/B2/B4/B5/B8

NA Version Working Band For North America

5G: n2/n5/n12/n25/n66/n41/n48*/n71*/n77/n78

4G: B2/B4/B5/B7/B12/B13/B14/B17/B25/B26/B41/B42*/B43*/B48*/B66/B71*

3G: B2/B4/B5

Annotation:[*] It can be supported, but it needs extra debugging or affects other frequency bands