Help me To read Last recieved sms from hyper terminal

[Pic2008]

I can send and receive SMS in "text mode" using a Siemens GSM module connected to PIC.

I'm sending 2 chars AB from a remote mobile phone. In the PIC, it can receive AB.

I have declared

data var byte [4]
message var byte [4]

ws:
HSEROUT["AT+CMGL=",34,"REC UNREAD",34,13,10] 

HSERIN 5000,ws,[WAIT("REC UNREAD"),skip 3,str telbr\12,skip 12,str TIME\6,skip 8,STR message\3\13]

data[1] ="A"
data[2]="B"

if I compare message[1] with data[1], message[2] with data[2] both are equal.

However, if I were to sent ABC SMS to PIC, the following comparison give an error. Why?

ws:
HSEROUT["AT+CMGL=",34,"REC UNREAD",34,13,10] 

HSERIN 5000,ws,[WAIT("REC UNREAD"),skip 3,str telbr\12,skip 12,str TIME\6,skip 8,STR message\4\13]

data[1] ="A"
data[2]="B"
data[3]="C"

if I compare message[1] with data[1], message[2] with data[2],  message[3] with data[3], error in the comparison