1.6 Mobile Device Connectivity

Question 1

Wire / cellular data network

Answer 1

Your phone has an Internet connection
• Use your mobile provider network
• Take advantage of this connectivity
• Hotspot
• Turn your phone into a WiFi Router
• You may have to pay extra phone charges
• Other devices connect to your phone via WiFi
• Tethering
• Anchored to your mobile device
• Connect your laptop via USB or Bluetooth
• Single connection
• May require additional services from phone provider
• Airplane mode - One button turns off all radios
• Cellular, WiFi, Bluetooth, NFC, etc.
• You can re-enable individual features
without enabling cellular features
• Useful when the airplane has WiFi

Question 2

Wireless networks

Answer 2

• Enable and disable cellular, WiFi,
and Bluetooth independently
• Airplanes, conserve battery
• iOS - Settings / Cellular
• Android - Settings / Wireless & network settings

Question 3

Bluetooth

Answer 3

• Short-range personal area network (PAN)
• About 10 meters
• Connect different devices
• Mouse, keyboard, headset, computer,
automobile, speakers
• Once paired, devices work together
• Connect and disconnect automatically

Question 4

Bluetooth pairing process

Answer 4

• Enable Bluetooth on both devices
• Android and iOS: Settings / Bluetooth
• Set devices to discoverable mode
• May require key sequence on Bluetooth device
• Select discovered device
• Many devices may appear!
• Enter or confirm PIN
• Should be the same on both devices
• Test connectivity
• Devices should now communicate

Question 5

Your phone is a radio

Answer 5

• Baseband radio processor
• A network interface for your radio
• This isn’t WiFi or Bluetooth
• Has its own firmware and memory
• Quite proprietary
• Real-time operating system
• Everything happens very quickly as needed
• The firmware can be updated
• Over the air (OTA)
• Invisible to the end user

Question 6

Phone updates

Answer 6

• PRL updates
• Preferred Roaming List
• CDMA networks (i.e., Verizon, Sprint)
• Allows your phone to connect to the right tower
• Can be updated over the air (OTA)
• PRI updates
• Product Release Instructions
• Radio settings - ID numbers, network codes,
country codes, etc.
• Also updated over the air

Question 7

IMEI

Answer 7

• International Mobile Station Equipment Identity
• Identifies a physical mobile device
• Every phone has a different IMEI
• Can be used to allow or disallow access

Question 8

IMSI

Answer 8

• International Mobile Subscriber Identity
• Identifies the user of a mobile network
• Can be provisioned in the SIM card
• Swap the SIM to move between phones

Question 9

VPN

Answer 9

• Turn your phone into a VPN endpoint
• Important for secure communication
• Integrated into the phone OS
• No additional software required
• May require some additional setup
• Detailed configuration settings
• May support multifactor authentication
• RSA SecureID

Question 10

Email configurations

Answer 10

• Retrieving mail - POP3, IMAP
• Sending mail - SMTP
• Corporate email - Microsoft Exchange
• Integrated providers
• iCloud, Google, Exchange Online, Yahoo

Question 11

Retrieving mail messages

Answer 11

• Post Office Protocol 3 (POP3)
• Used for downloading mail to local mail client
• Downloads and (optionally) deletes from server
• Configuration information
• Name of POP3 server
• Username and password
• Network ports
• Defined by your mail provider
• POP3: tcp/110
• SSL (Secure Socket Layer) settings - POP3S: tcp/995
• Internet Message Access Protocol (IMAP4)
• Access mail on a central server,
• Mail is usually stored on the server
• Supports folders and server-side searching
• Configuration information
• Name of IMAP server
• Username and password
• Network ports
• Defined by your mail provider
• IMAP: tcp/143
• SSL (Secure Socket Layer) settings - IMAPS: tcp/993

Question 12

Sending email

Answer 12

• SMTP - Simple Mail Transfer Protocol
• Send mail from a device to a mail server
• Or between mail servers
• You usually must send from a local or trusted device
• Authentication usually required
• May be different credentials than the incoming mail
• Port numbers
• SMTP (no authentication, relatively unused): tcp/25
• SMTP with authentication: tcp/587

Question 13

Microsoft Exchange

Answer 13

• Enterprise email
• Not a service for the home
• More than just email
• Contacts, Calendars, Reminders
• Integrates with mobile device database
• Integrated contacts, calendars, etc.
• Configuration options
• Email, server, domain, username, password
• Integrated message encryption with S/MIME
• Secure/Multipurpose Internet Mail Extensions
• Encrypt and digitally sign

Question 14

Commercial email providers

Answer 14

Gmail
• Google email, splits inbox into tabs, IMAP4, POP3
• Exchange Online (hosted email)
• IMAP4 and POP3 support
• iCloud Mail - Apple Mail, IMAP4 support only
• Yahoo Mail - IMAP4 and POP3 support