以前是可以的，这几天突然不行了？错误码是21，网上搜了一下：
21 - "Short message transfer rejected"
This cause indicates that the equipment sending this cause does not wish to accept this short message, although it could have accepted the short message since the equipment sending this cause is neither busy nor incompatible.
难道是国庆将至，北京这一块连wap push都不让我发了吗？（通过GSM猫发的，不是通过联通的网关）。
------解决方案--------------------
国庆将至，可能封网了，不让发wap push
------解决方案--------------------
RIL_E_INVALIDINDEX (CMEError 21)
------解决方案--------------------