Feature phone is a term typically used as a retronym to describe a class of handheld computers.

Feature phones tend to use a proprietary, custom-designed software and user interface, and lack the capabilities of smartphones.

Feature phones typically provide voice calling and text messaging functionality, in addition to basic multimedia and Internet capabilities, and other services offered by the user's wireless service provider.

Feature phones have a backlit LCD screen and may have a physical keyboard, a low-quality microphone, micro USB port, microSD card slot, a rear-facing low-quality camera to record video and capture pictures; and GPS.

If advanced enough, feature phones will sometimes include a rudimentary app store that will include basic software such as a calculator program or simple video games.

A smartphone is a handheld personal computer.

It possesses extensive computing capabilities, including high-speed access to the Internet using both Wi-Fi and mobile broadband.

Most, if not all, smartphones are also built with support for Bluetooth and satellite navigation.

Modern smartphones have a touchscreen color display with a graphical user interface that covers the front surface and enables the user to use a virtual keyboard to type and press onscreen icons.

Interaction is mostly done using touch, besides a few physical buttons.

Smartphones are typically pocket-sized, with somewhat larger sizes being called phablets; they are generally smaller than tablet computers.

Smartphones function using a rechargeable lithium-ion or lithium-polymer battery.

Android is a mobile operating system developed by Google, based on a modified version of the Linux kernel and other open source software and designed primarily for touchscreen mobile devices such as smartphones and tablets.

In addition, Google has further developed Android TV for televisions, Android Auto for cars, and Wear OS for wrist watches, each with a specialized user interface.

Variants of Android are also used on game consoles, digital cameras, PCs and other electronics.

Bangladesh (lit. "The country of Bengal"), officially the People's Republic of Bangladesh, is a country in South Asia.

It shares land borders with India and Myanmar (Burma).

Nepal, Bhutan and China are located near Bangladesh but do not share a border with it.

The country's maritime territory in the Bay of Bengal is roughly equal to the size of its land area.

Bangladesh is the world's eighth most populous country.

Dhaka is its capital and largest city, followed by Chittagong, which has the country's largest port.

Bangladesh forms the largest and easternmost part of the Bengal region.

Bangladeshis include people from a range of ethnic groups and religions.

Bengalis, who speak the official Bengali language, make up 98% of the population.

The politically dominant Bengali Muslims make the nation the world's third largest Muslim-majority country.

A mobile phone, known as a cell phone in North America, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.

The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN).

Modern mobile telephone services use a cellular network architecture, and, therefore, mobile telephones are called cellular telephones or cell phones, in North America.

In addition to telephony, 2000s-era mobile phones support a variety of other services, such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, video games, and digital photography.

Mobile phones offering only those capabilities are known as feature phones; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones.