GPS/GSM/GPRS模块调试遇到问题

用UNO+GPS/GPRS/GSM V3.0，按照教程操作，进行GPRS实验遇到问题，用AT+CIPSEND指令发送数据后返回CLOSED和ERROR，串口调试内容如下：
RDY
+CFUN: 1
+CPIN: READY
GPS Ready
Call Ready
AT
OK
AT+CSTT
OK
AT+CIICR
OK
AT+CIFSR
10.113.126.236
AT+CIPSTART="TCP","tcp.lewei50.com",9960
OK
CONNECT OK
AT+CIPSEND
> {"method": "update","gatewayNo": "02","userkey": "610af9ed5d644e4dab0059ce5e073eb0"}&^!
CLOSED
ERROR

看下配置乐联是这两个参数是否已修改正确"gatewayNo": "02","userkey": "610af9ed5d644e4dab0059ce5e073eb0"。另外因为用到了GPRS功能，所以看一下SIM卡能否正常工作以及是否有钱，可以试试用模块打电话看是否能够正常打出去