how to use a smartphone Internet with trip to Bangkok and a local SIM card in Thailand.

I will compare the advantages and disadvantages of using the Internet with a smartphone during a free trip to Thailand, data roaming with a mobile operator, pocket WiFi, and using a local USIM (sim card), and in particular, explain in detail how to use a Thai SIM (sim card). . Mobile carrier selection, product selection (call availability), replacement method, internet speed test, remaining capacity check, my number check, language change to English, etc.
*BGM
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