Screen Orientation and Calibration

The eBook viewed in portrait mode is very natural because it is similar to the original book. In general, users can choose the viewing mode that is most comfortable for them in any type of content.

Many mobile devices have sensors, such as accelerometers, that can determine how they are being positioned. Content is automatically rotated to the device position. This feature is useful, for example, when taking photos. When the device is switched to landscape mode, the camera app also switches to landscape mode. Also, when the user is composing a text, automatically changing the device automatically changes the application to landscape mode, and the keyboard gets wider and wider.



Another common feature of mobile devices is the Global Positioning System (GPS). GPS is a navigation system that determines device time and geolocation using satellite and space receiver messages in space. A GPS radio receiver uses at least four satellites to calculate its position based on messages. GPS is very accurate and can be used in most weather conditions. However, dense vegetation, tunnels and towering buildings may interrupt satellite signals.

Check Settings> Display> Auto-rotate screen

When using iOS, use the following route to enable automatic rotation .

Swipe from the bottom of the screen> tap the lock icon to the right

Screen calibration

When using a mobile device, you may need to adjust the screen brightness. Increase the brightness level of the screen when using a mobile device on the outside as the bright sunlight makes the screen very difficult to read. On the contrary, reading a book on a mobile device at night helps with little brightness. Depending on the amount of light nearby, some mobile devices may configure to adjust the brightness automatically.

The LCD screen uses more battery power for most mobile devices. Brightness reduction or the use of auto brightness help save battery power. Set the brightness to the lowest setting to get the maximum battery life from the device.

When using an Android device, to configure the screen brightness,  use the following:

Slide the settings> Display> Brightness> Brightness to the desired level

To set the screen brightness, when using an iOS device, use the following path:

Swipe from the bottom of the screen> tap the lock icon to the right

Alternatively, to set the brightness in the settings menu, use the following path:

Slide settings> Display & Brightness> Brightness to the desired level or tap the auto-brightness toggle.



GPS devices for cars, boats, and hacked hold devices that use hackers and backpackers. On mobile devices, GPS receivers have many different uses.

Navigation – A mapping app that rotates locations, addresses, or points in one direction.
Geocaching. A mapping app that shows the location of the geocache. Geocaches are containers that are hidden around the world. Customers look for them and often sign in to log in to find out.
Geotagging – records location information in a digital object, such as a photography or video, where it has been taken.
Special Search Results – For example, shows results based on proximity, such as restaurants that are nearby when searching for keyword keywords.
Device tracking – Finds a map on the map if it’s lost or stolen.

To enable GPS on iOS devices, use the following route, as shown in Figure :

Turn on Settings> Privacy> Location Services> Location Services

Note: Some Android and iOS devices don’t have GPS receivers. These devices use information obtained from Wi-Fi networks and cellular networks to provide location services.



Convenience Features

Modern mobile devices are primarily small computers. As a result, many features are being developed for modern smartphones. The following are some of these features:

Wi-Fi calling

Wi-Fi networks are usually connected to the Internet in places, such as coffee shops, work locations, libraries or homes. The phone can place voice calls through local Wi-Fi hotspots. If there is no Wi-Fi hotspot in the reach, the phone will use a cellular carrier network to transport voice calls.

Wi-Fi calling is very useful in areas with poor cellular coverage because local Wi-Fi hotspots are used to fill this gap. Wi-Fi hotspots must be able to guarantee at least 1Mbps input on the Internet for good quality calls. When Wi-Fi calling is enabled and in use during voice calls, the phone will display “Wi-Fi” next to the carrier’s name.

As shown in Figure , to enable Wi-Fi calling on Android, use the following route:

Tap on Settings> More (under the Wireless & networks section)> Wi-Fi calling> Toggle to turn it on.

To enable Wi-Fi calling on iOS, use the following route .

Turn on Settings> Phone and Wi-Fi calling

Note: Not all cellular carriers allow Wi-Fi calling. If you cannot enable it on your phone, your carrier or mobile device may not support it.



Mobile payments

Mobile payment refers to any payment made via mobile phone, as shown in Figure 3.

Premium SMS Based Transaction Payment Consumers send an SMS message containing payment request to the carrier’s special phone number. The seller is informed that the payment has been received and cleared to release the goods.
Direct mobile billing. By using the mobile billing option at checkout, the user identifies him or her (usually via two-factor authentication) and allows the charge to be added to the mobile service bill. It is very popular in Asia and has the following advantages: Security, convenience, and no bank card or credit card required.
Mobile Web Payments – Uses web or dedicated apps to complete customer transactions. This method relies on wireless application protocols (WAPs) and usually requires credit cards or pre-registered online payment solutions such as PayPal.
Contactless NFC (Near Field Communication) – This method is mostly used in physical store transactions. A customer pays for the good or service by waving a phone near the payment system.Based on a unique identity, the payment is made against a pre-paid account or bank account. NFC is also widely used in transportation services, public parking areas and many consumer areas ( Buy Iphone in Ghana).



Virtual private network (VPN)

Virtual Private Network (VPN) is a private network that uses a public network (usually the Internet) to connect with remote sites or users. Instead of using a dedicated lease line, VPN uses a “virtual” connection from the company’s private network to a remote site or employee via the Internet.

Many companies set up their own Virtual Private Network (VPN) to meet the needs of remote employees and remote offices. With the proliferation of mobile devices, integrating VPN clients into smartphones and tablets was a natural step.

When a VPN is established from a client to the server, the client accesses the network behind the server as if it were directly connected to the network. Because VPN protocols also allow for encryption of data, communication between client and server is secure and secure for business.

To create a new VPN connection on Android, use the following route:

Tap on the Settings> More (under Wireless & Networks section)> VPN> + Mark to add VPN connection.

To create a new VPN connection to iOS, use the following route, as shown in Figure 5:

Settings> General> VPN> Add VPN configuration …

When VPN information is added to the device, it is necessary to start the device before sending and receiving traffic through it.

As shown in Figure 6, to start VPN on Android, use the following route:

Select Settings> General> VPN> Required VPN connection> Enter username and password> Contact

To start VPN on iOS, use the following route :

Toggle VPN on Settings>



Information properties

Virtual Assistants

A digital assistant, sometimes referred to as a virtual assistant, is a program that uses natural communication to communicate.

Google Now

To access Google Now on an Android device, as shown in Figure 1, follow these steps:

Just say “Ok Google”. Google Now will be enabled and start listening for requests, as shown in Figure 2.


Alternatively, Siri can be configured to start listening commands when listening to “Hey Siri”, as shown in Figure 4, to enable “Hey Siri”, use the following path:

Settings> General> Siri> Toggle “Hey Siri” to run.




To access Cortana on a Windows device, follow these steps:Press and hold the Search button. Cortana will activate and start listening to requests.



Emergency notification

Wireless Emergency Alerts (WEAs) are emergency messages sent by authorities via mobile carriers. In the United States, government partners include: local and state public safety agencies, FEMA, the FCC, the Department of Homeland Security, and the National Weather Service. Mobile carriers do not charge for WEA messages.

Timely alerts can help save lives during an emergency. Through WEA, alerts can be sent to mobile devices without the user having to download the app or subscribe to a service.

The WEA looks like a regular text message and contains the type and timing of the alert, any suggested actions and the alert issuing agency. WEA is relatively short, no more than 90 characters.

Presidential Alerts – Alerts issued by the president or an agent.
Dangerous Alert. The warnings include human-caused or natural disasters such as hurricanes, earthquakes and tornadoes, where there is a near-life threat.
Amber Alerts – Alerts meet the US Department of Justice’s criteria for helping law enforcement agencies search and locate an abducted child.

You may need to enroll a device with a carrier, or provide some kind of unique identifier. Each mobile device has a unique 15-digit number known as International Mobile Device Identification (IMEI). This number identifies the device carrier’s network. This number comes from a family of devices called the Global System for Mobile Communication (GSM). The numbers can often be found in the device configuration, or in the battery compartment, if the battery is removable.

The device’s user ID has also been identified as unique, called the International Mobile Subscriber Identity (IMSI). IMSI is often programmed on a user identification module (SIM) card, or can be programmed on the phone itself, depending on the type of network.