Wi-Fi Wireless Connection Problem and Solution in Mobile Cell Phone

What is Wi-Fi?

Wi-Fi or WiFi is a local area wireless computer networking technology that allows electronic devices to connect to the network, mainly using the 2.4 gigahertz (12 cm) UHF and 5 gigahertz (6 cm) SHF ISM radio bands.

The Wi-Fi Alliance defines Wi-Fi as any "wireless local area network" (WLAN) product based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards. However, the term "Wi-Fi" is used in general English as a synonym for "WLAN" since most modern WLANs are based on these standards. "Wi-Fi" is a trademark of the Wi-Fi Alliance. The "Wi-Fi Certified" trademark can only be used by Wi-Fi products that successfully complete Wi-Fi Alliance interoperability certification testing.

Many devices can use Wi-Fi, e.g. personal computers, video-game consoles, smartphones, digital cameras, tablet computers and digital audio players. These can connect to a network resource such as the Internet via a wireless network access point. Such an access point (or hotspot) has a range of about 20 meters (66 feet) indoors and a greater range outdoors. Hotspot coverage can be as small as a single room with walls that block radio waves, or as large as many square kilometres achieved by using multiple overlapping access points.

Wi-Fi is less secure than wired connections, such as Ethernet, precisely because an intruder does not need a physical connection. Web pages that use TLS are secure, but unencrypted internet access can easily be detected by intruders. Because of this, Wi-Fi has adopted various encryption technologies. The early encryption WEP proved easy to break. Higher quality protocols (WPA, WPA2) were added later. An optional feature added in 2007, called Wi-Fi Protected Setup (WPS), had a serious flaw that allowed an attacker to recover the router's password. The Wi-Fi Alliance has since updated its test plan and certification program to ensure all newly certified devices resist attacks

Wi-Fi Wireless Internet Connection Problem

There are situation when a mobile cell phone of any brand including Samsung, Nokia, LG, iPhone, Micromax, China Mobile Phones etc may give problems such as Wi-Fi wireless internet connection.

There can be different symptoms, reasons and solutions to identify, solve and fix the problem.

How to Solve and Fix Mobile Cell WiFi Wireless Internet Connection Problem

1. Enable Wi-Fi and check if it is working or not. Make sure you are connected to a wireless Wi-Fi Network. Make sure the password is correct. 
2. If the Wi-Fi cannot be enabled and you are not able to use or access internet then there could be problem with the Mobile Phone PCB or the WiFi Controller IC. You may have to replace the PCB. 
3. If the Wi-Fi can be enabled then there is no problem with the PCB. Just upgrade the software / operating system (OS) of the mobile phone or smartphone to the latest version. This should solve the problem.