The Transportation Security Administration (TSA) currently states that there is no limit on the number of phones you carry.
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The Transportation Security Administration (TSA) allows for multiple electronic devices, making it totally okay for you to bring both phones. Make sure that all of your devices are fully charged and in compliance with the airline's safety regulations before boarding.
Individuals who own or possess a Samsung Galaxy Note7 device may not transport the device on their person, in carry-on baggage, or in checked baggage on flights to, from, or within the United States. This prohibition includes all Samsung Galaxy Note7 devices. The phones also cannot be shipped as air cargo.
“The FCC and FAA ban cell phones for airborne use, because its signals could interfere with critical aircraft instruments. Devices must be used in airplane mode or with the cellular connection disabled.
Battery lifeHaving two phones means that you can have one phone for personal communication and for entertainment. You can dedicate the other phone for business calls and messages. This helps you conserve battery life since one phone won't have to do it all.
It comes down to your style of travel. If I'm traveling exclusively in Europe or only one country or zone where one phone company have coverage, I generally leave the 2nd phone behind. If I travel across multiple zones (including outside of Europe) and am on the road for a long time, the 2nd phone comes in very handy.
Carrying one sealed box of iPhone might not be an issue but if you are carrying 3-4 devices, you will have to show the receipts of your purchases and might even have to pay a customs duty. So, it's better that you avoid carrying more than two phones on your flight from USA to India.
TSA Rules for Multiple LaptopsThe Transportation Security Administration does not limit the number of laptops that you pack in your carry-on bag, even for international flights.