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Is the gizDuino SIM800L shield need to use an external power source?
How will i know if there's a signal or not? (SIM800L)
What is the difference between SIM900 and SIM800/L?
What size of SIMCard will i use for SIM800L Shield?
What happens if the replies of SIM800L shield is not exact characters? (ex. if i send "Hello", then i received like this "