Originally Posted by geopiet
I recently upgraded to 4.5. and noticed that SMS setings has different options than under system 4.2
New 4.5 options:
"Network to send over" CS, CS Preferred, PS Preferred, PS.
"Network to send over" GSM, GPRS or GPRS
PS and CS = Gprs and GSM
CS Only = GSM Only
PS stands for Packet Switch data (GPRS), and CS stands for Circuit Switch data (dial up).
cs: is circuit switched. this is equivalent to dialup data (i.e. when you dial a telephone number) and the data is conveyed in a similar manner to a voice call
cs and ps/gprs is gsm
If you select 'CS only' then you can only make a CS type connection as described above. You will not be able to make a GPRS / 3G connection, indeed I think you will find that the phone won't even connect to GPRS / 3G, it'll say 'gprs detached'.
ps: is packet switched. this is where packets of data are transmitted either by gprs or by 3g
ps/3g is umts
If you set the phone to 'PS only', then you can make a GPRS / 3G connection, but not a CS connection at the same time as the GPRS / 3G connection is active. The implication of this is that you can't receive a call (which is CS) while your GPRS / 3G connection is active.
The "CS" setting improves battery