Mobile Operating Systems

How to Make a Conference Call from iPhone or Android Phone

2020-09-03T18:02:00.001-07:00

Do you want to talk to several people at once and coordinate a meeting? Then this article is for you. Mobile phones allow you to conduct a conference call. You can combine them into a single call so that everyone can talk to each other.

The number of participants on a conference call and the ability to add, merge, or disconnect individual callers depends on your carrier. You can contact your carrier and get more information about your conference call options.

How to make a conference call from your iPhone or Android Phone

You can set up a conference call If your carrier supports it. You can merge up to five people.

Dial to the first person you need to call. Wait for the call to connect.
Tap on add call
Dial to the second person. Wait for the call to connect.
Tap on merge calls.
Now both calls merge into a conference call.
If you need to add more people to the conference, then repeat the steps from 2 to 4
If you do not see the option to add another call then you have reached to the maximum number of participants that you can connect to the conference.

Please note that only the person who started the call can see the names of all participants. If a participant adds someone else then they can see only the names of the people they have added and the person who started the coversation.

Your carrier might not support call conferencing if you don’t see the merge call option.

How to Unmerge or drop a caller

You are conducting a conference call. Now you need to remove someone from the conference, but need to keep them on the line. How can you do that? It’s simple. Do this.

On the conference call management screen you can see all the people engage in the call along with their numbers. To do this you have to tap on the Unmerge button (i.e. the splitting arrows) beside their name.
If you want to disconnect someone out from the call, you simply need to tap on the Disconnect button (i.e. the downward facing phone icon) beside their name.

Disconnect yourself from the conference call

To do this tap on the red End Call button at the bottom of the screen.
Here please note that this will not end the entire call conversation. All the other parties in the call can still talk to each other until they hang up.

Things to be considered when making conference calls

Try to engage in a call from where there are as much as little noise in the environment.
Mute your microphone while others are talking. This will reduce the background noise of the call.
Increase privacy and efficiency by using call management options.

Apps that can be used to conduct conference calls

Skype (www.skype.com)
Google Hangouts (hangouts.google.com)
ooVoo (www.oovoo.com)
WeChat (www.wechat.com)
Popcorn Buzz (line.me/en/family-apps)
WhatsApp

Mobile Operating System Structure

2012-07-01T08:00:00.002-07:00

A mobile OS is a software platform on top of which other programs called application

programs, can run on mobile devices such as PDA, cellular phones, smartphone and etc.

Low Level Hardware

Mobile Processors

Processors use RISC architecture

Mainly two types

1.ARM Processors

   It is a 32-bit RISC processor architecture

   Low power consumption
   e.g:- Qualcomm Snapdragon
   Marvell's XScale
Texas Instruments OMAP series

2.MIPS - Microprocessor without Interlocked Pipeline Stages

   Mainly used in embedded systems
e.g:-TiVo, Playstation1 & 2

Mobile Memory

The better the memory management offered by the OS, the wider the options available to

applications developers

Mobile devices have two types of memories

ROM - For operating system and preinstalled programs

RAM - For user information

Types of RAMs

DRAM (Dynamic RAM): cheapest, used in mobile devices

EDO (Enhanced Data Output): more expensive but offers a speed increase over DRAM

(WindowsCE)

SDRAM (Synchronous Dynamic RAM): a further 50% speed (iPAQ)

DDR (Double Data Rate) SDRAM is twice as fast as SDRAM

OUM (Ovonics Unified Memory): experimental

Kernal

Responsible for services such as

Security

Memory Management

Process Management

It include the following components

I/O Components

File Systems

Networking Components

Libraries & Application Framework

Libraries

Media Libraries

3D Libraries, etc.

Application Framework

These Libraries are exposed to developers through the application framework.

Low-Level Hardware, Manufacturer Device Drivers

Mobile Operating System Constraints

2012-07-01T07:04:00.001-07:00

Design and capabilities of a Mobile OS (Operating System) is very different than a general

purpose OS running on desktop machines

Physically Constrained

Battery-powered device
Small screens of varying shapes, sizes, and resolutions
Memory
Storage space

Working in Uncertainty

Networks come and go
Other devices appear and disappear
OS need to provide robust methods for handling connections and coping with service interruptions
and ad hoc attempts to communicate

Mobile Operating Systems Market Share

2012-07-01T06:20:00.003-07:00

Mobile Operating Systems History

2012-07-01T06:14:00.000-07:00

1979-1992 Mobile phones have embedded systems to control operation.

1993 - The first smartphone, the IBM Simon introduced.

1996 - First Windows CE Handheld PC devices are introduced.

2000 – With Ericsson R380 Symbian introduced the first modern mobile OS on a smartphone.

2005 Nokia introduced Maemo OS on the first internet tablet N770.

2007 Apple introduced iOS with iPod

2007 Open Handset Alliance (OHA) formed by Google, HTC, Sony, Dell, Intel, Motorola,

Samsung, LG, etc.

2008 OHA releases HTC Dream as the first Android phone.

2011 The First Linux based OS MeeGo is introduced.

2012 The Lenovo K800, first Intel powered smartphone (Android OS) introduced.

What is a Mobile Operating System?

2012-07-01T06:08:00.001-07:00

A mobile operating system is the operating system that controls a smartphone, tablet, PDA, or other mobile device.

Modern mobile operating systems combine the features of a personal computer operating system with touchscreen, cellular, Bluetooth, WiFi, GPS mobile navigation, camera, video camera, speech recognition, voice recorder, music player, Near field communication, personal digital assistant (PDA), and other features.