我有一个带有这个GSM 帽子的 Raspberry PI，我想用它连接到移动网络。我尝试了几种gprs文件组合来实现这一点，但它们都不起作用。
我试图通过 wiki 上提供的说明进行操作。这导致了一个错误：
Script /usr/sbin/chat -v -f /etc/chatscripts/gprs finished (pid 1569), status = 0x3
当我使用此命令开始连接时：pppd call gprs &
如果我检查/var/log/syslog文件，我会得到这个：
pppd[991]: pppd 2.4.7 started by pi, uid 0
chat[994]: abort on (BUSY)
chat[994]: abort on (VOICE)
chat[994]: abort on (NO CARRIER)
chat[994]: abort on (NO DIALTONE)
chat[994]: abort on (NO DIAL TONE)
chat[994]: abort on (NO ANSWER)
chat[994]: abort on (DELAYED)
chat[994]: abort on (ERROR)
chat[994]: abort on (+CGATT: 0)
chat[994]: send (AT^M)
chat[994]: timeout set to 12 seconds
chat[994]: expect (OK)
chat[994]: alarm
chat[994]: Failed
pppd[991]: Script /usr/sbin/chat -v -f /etc/chatscripts/gprs finished (pid 993), status = 0x3
pppd[991]: Connect script failed
/etc/ppp/peers/gprs文件：
#!/bin/bash
user "myusername@realm"
connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs"
#/dev/modem
/dev/ttyS0
# Speed of the serial line.
115200
nocrtscts
debug
ipcp-accept-local
ipcp-accept-remote
# Assumes that your IP address is allocated dynamically by the ISP.
noipdefault
# Try to get the name server addresses from the ISP.
usepeerdns
# Use this connection as the default route.
defaultroute
# Makes pppd "dial again" when the connection is lost.
persist
# Do not ask the remote to authenticate.
noauth
我还更改了/etc/chatscripts/gprs文件中的引脚：
# +CPIN provides the SIM card PIN
OK "AT+CPIN=1234"