How To Check Balance By Ussd - ETT ET-BASE GSM SIM900 Manual

Manual of Board ET-BASE GSM SIM900
This is an example of checking balance of 1-2-CALL. If it is
general cell phone, it only types "*121#" and call; but, if it is
Module SIM900, it has to use the Command ATD and follows by the sign
instead as shown in the example below;
ATD*121#<Ent>
OK
+CUSD: 0,"The balance of 0870681xxx is 111.62 B. & valid until 03/05/13
Pay59B.Get3G/EDGE 70MB within7days exceed up to main pro.Press*500*70#",64
This is an example of receiving a call. When there is an
incoming telephone call in case of using Module SIM900, it shows the
message "RING" and user can hear ringtone from speaker (receiver) of
handset. It uses the Command ATA in order to receive a call, or it
uses the Command ATH to hang up or cancel or reject an incoming call
as shown in the example below;
RING
ATA<Ent>
OK
It uses the Command AT+CLIP=1 and follows by Enter in order to
show an incoming telephone number, the Module will show the incoming
telephone number as shown in the example below;
RING
+CLIP: "0894469xxx",129,"",,"",0

13. How to check balance by USSD

It also
(Unstructure Supplementary
example below shows how to check balance in case of 1-2-CALL.
AT+CUSD=1,"*121#"<Ent>
OK
+CUSD: 0,"The balance of 0870681xxx is 111.62 B. & valid until 03/05/13
Pay59B.Get3G/EDGE 70MB within7days exceed up to main pro.Press*500*70#",64
ETT CO., LTD.
uses the Command
Service
-18-
AT+CUSD and follows
Data) to check
by USSD
balance. The
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