Connectivity in Mobile Phone

There are 2 types - Internet and Local Connectivity
Internet

GPRS
GPRS-General Packet Radio Service, is a packet oriented mobile data service on the 2G and 3G cellular communication system used in GSM network. GPRS usage is typically charged based on volume of data transferred.

In 2G systems, GPRS provides data rates of 56–114 kbit/second.

2G cellular technology combined with GPRS is sometimes described as 2.5G,
that is, a technology between the second (2G) and third (3G) generations of mobile telephony.

2G

2G is second-generation cellular technology.

Three primary benefits of 2G networks over their predecessors were that
 phone conversations were digitally encrypted; 2G systems were significantly more efficient on the spectrum allowing for far greater wireless penetration levels; and 2G introduced data services for mobile, starting with SMS text messages.

2G technologies enabled the various networks to provide the services such as text messages, picture messages, and MMS (multimedia messages). All text messages sent over 2G are digitally encrypted, allowing for the transfer of data in such a way that only the intended receiver can receive and read it.

2G has been superseded by newer technologies such as 2.5G, 2.75G, 3G, and 4G; however,
 2G networks are still used in most parts of the world.

With General Packet Radio Service (GPRS), 2G offers a theoretical maximum transfer speed of 50 kbit/s (40 kbit/s in practice).

With EDGE (Enhanced Data Rates for GSM Evolution),
there is a theoretical maximum transfer speed of 1 Mbit/s (500 kbit/s in practice).

3G

3G is the third generation of wireless mobile telecommunications technology.

It is the upgrade for 2G and 2.5G GPRS networks, for faster internet speed.

3G telecommunication networks support services that provide an information transfer
rate of at least 2 Mbit/s.

Later 3G releases, often denoted 3.5G and 3.75G, also provide mobile broadband
access of several Mbit/s to smartphones and mobile modems in laptop computers.
This ensures that it can be applied to wireless voice telephony, mobile Internet access,
fixed wireless Internet access, video calls and mobile TV technologies.

4G

4G is the fourth generation of broadband cellular network technology, succeeding 3G.

A 4G system provide capabilities to mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, and 3D television.
Long Term Evolution (LTE) standard is type of 4G technology.

4G standard specifies the peak speed requirements at 100 megabits per second (Mbit/s), for high mobility communication (such as from trains and cars) and 1 gigabit per second (Gbit/s) for low mobility communication (such as pedestrians and stationary users).

WiFi

WiFi is a technology for wireless local area networking with devices based on the IEEE 802.11 standards. Wifi is used as a replacement for cable network.

Example 1: A wired DSL / broadband modem can broadcast signals through its wired network ports or wireless WiFi Connectivity.

This wifi option has a gateway or wireless access point, either with a password or without password (open network).

If the access point is named as homenet, this  will show in your mobile WiFi settings.

From your mobile you can select homenet and entering the password given by the owner, you get connected to the wired modem.

If internet is working in the wired modem, then you will also receive the internet.

If internet is not working in the modem, you will be connected to the WiFi locally to the modem, but internet will not work in your phone.


Example 2: A wireless modem, with wifi connectivity can give internet to devices or phones connected to it. Hence you can connect your phones to this modem also.


Example 3: There are wifi WAN services (wireless internet). You can connect to their access point with a account or id and password.


Note: Your mobile also can act as wifi server, providing internet access to other mobile or wireless devices. To do this, You need to create a hotspot or tethering option in your mobile phone settings.


Generally access point (or hotspot) has a range of about 20 meters (66 feet) indoors and a greater range outdoors.

WiFi provides service in private homes, businesses, as well as in public spaces at Wi-Fi hotspots set up either free-of-charge or commercially.
Organizations and businesses, such as airports, hotels, and restaurants, often provide free-use hotspots to attract customers.

Wi-Fi Protected Access encryption (WPA2) is considered secure, provided a strong passphrase is used.
Local Connectivity

Data Cable
 
A data cable can be used to transfer files between a mobile and a computer system. You can transfer pictures, videos and other files using this option.
Bluetooth



You can switch On you bluetooth settings and scan for devices. When you rename your phone in bluetooth settings, this will be shown in other phone bluetooth scan. You can assign a password or auto generated letters for pairing two mobile phones. Once paired both the phones will be connected through bluetooth. You can transfer files and folders through this option locally.
WiFi

 

If you are connected to a Wifi Modem or any hotspot, you will be connected to a local network. All the phones in this network can be interconnected using sharing apps or other sharing options. This way you can share your files and folders between mobile phones using Wifi.

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