What are the different numbers at the end of a smartphone box?

Last Updated on January 2, 2022 by Vinay Kharayat

Nearly every individual uses a smartphone regardless of what age group you fall to and ever wondered what are the different numbers at the end of a smartphone cell phone box stand for? No worries, I got your back. We will get to know different numbers at the end of a smartphone cell phone box.

Here I am using the box of Vivo V2050 to make it easier for you to understand.

We will also come to know about terms related to the mobile box.

Different components at the end of the mobile box

Okay so let’s break down the different acronyms at the back of your mobile box!


IMEI or International Mobile Equipment Identity, a 15 digit number used to identify the unique features of mobile phones and make them different from one another. You can also check IMEI numbers just by looking at the back of your cell phone box or by simply dialing *#06#.

Model Number

Wondered how to Find Out Your Android Phone’s Model Number, you can find it behind your smartphone box. Usually, the model number is the complete name of your mobile phone. For example, if I have POCO X3 Pro then X3 Pro is the model number of my smartphone.


ESN or Equipment Serial Number, assigned during the time of manufacturing. It comes in two forms one in hexadecimal form (number representation used by a computer) and the other in normal decimal form(Human readable format).


SAR or Specific absorption rate focuses to determine the radio frequency rate in mobile. In India, the ideal SAR rate is 1.6W/kg. The rate of exposure that is being exposed by a mobile phone due to radiation.

Also Read- 5G radiation effects, symptoms & prevention.


A Global System for Mobiles or a GSM, a network technology with two radio networks used by the wireless carriers in the mobiles and tablets for network stabilization.

This is one of the unique features of mobile phones.


PIN or Personal Identification Number locates the uniqueness for one’s own used handset, used during swapping a set or during the warranty period.

Other numbers at the end of a smartphone box


Subscriber Identity Module or better simplified as SIM is a smart card inserted in the mobile set just for the details of a telephone serial number. This comes under the Basic components of mobile phones.


Frequency Division Duplexing as the term suggests transmits and operates the data at different carrier frequencies within the wireless technologies. In the laymen term, it is a technique used to connect to your ISP(Internet service provider), so that you can upload and download at the same time but using different bands.

The FDD is the box I have taken is LTE: B1/B2/B3/B4/B5/B8.


TDD stands for Time Division Duplex. This is a little different than FDD, where in FDD uplinks and downlinks are handled simultaneously, TDD is used to separate the uplinks(uploads) and downlinks(downloads) signal by allocating different time slots.

The TDD in this phone is LTE: B38/B40/B41(120)5G: N78. This is one of the Latest smartphone features.


MEID stands for  Mobile Equipment Identifier a unique identification for a mobile network.


We are all familiar with different brands of smartphones in the current market but how many of us actually know this smartphone’s key elements.

After reading this article, you are now aware of all the terms mentioned above that are the key elements related to your smartphone box. These are not only necessary but also actually important for a smartphone user.

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