51控制SIM900A给用户发送短信，只需要修改电话号码就可以了
资源文件列表
sim900a/sim900a , 4715
sim900a/sim900a.c , 2358
sim900a/sim900a.hex , 1387
sim900a/sim900a.lnp , 46
sim900a/sim900a.LST , 5330
sim900a/sim900a.M51 , 7429
sim900a/sim900a.OBJ , 5243
sim900a/sim900a.plg , 947
sim900a/sim900a.uvopt , 72648
sim900a/sim900a.uvproj , 13235
sim900a/sim900a_uvproj.bak , 0