Issues starting up my SIM800L

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my first problem when went through datasheet of sim800l says requires maximum voltage 4.2v. each time step down voltage below 5v, device not come on. powers when voltage 5v. please can reason this. powering device using arduino uno.

secondly, reason why sim card not communicate gprs works voice calls , sends sms.

which module ?
arduino power may not sufficient.. 


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