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Data Transfer Kb

1G

Analogue

2G

GSM

3G

UTRAN

4G

HSDPA

Voice Call *

x

x

x

x

SMS < 160 bytes

x

x

x

x

Data Call ( 9600  baud )

x

x

-

-

Fax Call

x

x

-

-

Packet Switched Call

-

x

x

x

Picture Messaging

-

x

x

x

Data Transfer < 1 MB

x

x

x

x

Data Transfer > 1M to 10 MB

-

x

x

x

Data Transfer >10 MB

-

-

x

x

Voice over IP Streaming

-

-

x

x

Video Streaming

-

-

x

x

The table below shows a key as to which generation of cellular service will be acceptable for your application. Most modems and phones are described as either quad or tri band transmitters and receivers. This means that device can transmit or receive data on 3 or 4 channels. To put it simplistically and incorrectly each band represents a separate carrier technology. Because your device transmits on multiple bands it possible to have several services connected simultaneously. For example it is possible to talk on a mobile phone whilst running a 3G networking connection. An IP connection typically happens over something called a packet switched connection. With an analogue services a ( data call, fax call, and analogue voice calls ) data is sent over an analogue connection from the phone mast to your device. The main important difference is the way each service is charged. Analogue services are charged up to the call initiator on a per call basis, where as digital packet switched services are bought by the SIM owner on an allowance transfer basis.

Note the above table above is a guide. It important to bear in mind that a lot of the older services can be carried out over a 3G connection. For example if you intended to send out a lot of SMS message, which is very expensive way of sending data (typically 13p per 160 chars ). It is more cost effective to establish a 3G connection and use a text over IP service on the internet.  However if you only wanted to send texts very occasionally so as to indicate a fault conditions, using the phones SMS service may be preferable.