Data Sheet

SIM900 AT Commands Set
SIM900R01_ATC_V1.00 165 15.01.2010
preference to be used
0 Packet Domain
1 Circuit switched
2 Packet Domain preferred (use circuit switched if
GPRS not available)
3 Circuit switched preferred (use Packet Domain if
circuit switched not available)
Reference Note
z The circuit switched service route is the default method