Tutorial: https://www.youtube.com/watch?v=7GtfhTVDIc0
Código At+HTTP:
AT+SAPBR=3,1,"APN","CMNET"
AT+SAPBR=1,1
AT+SAPBR=2,1
AT+HTTPINIT
AT+HTTPPARA="CID",1
AT+HTTPPARA="URL","http://sandro.awardspace.info/php/hola.php?Tu_nombre=Renzo"
AT+HTTPACTION=0
AT+HTTPREAD
AT+HTTPTERM
AT+SAPBR=0,1