sending msg

Hi guys I read the topics about interfacing 8051 with gsm modem those are really helpful However when I implemented my program to receive a msg and give an acknowledgment(through sms) for same There went something wrong : While sending my sms modem doesn't send 1st 8 characters of my msg i.e. Consider example:

unsigned char *msg = "abcdefghijklmnop"

then my msg sending routine tend to send ijklmnop thats all can anybody help Thank you