For sending SMS send : AT+CMGS="000000000000" wait for '>' Write the text in ASCII (it's not ASCII to write but ASCII work" send 0x1A (ASCII SUB Substitute )
http://foxlx.acmesystems.it/foxlx_acmesystems_it/00003/1vv0300691_GM862-QUAD_Software_User_Guide_issue0.pdf 3.5.5 page 89 of the guide
