SIM800L EVB doesn't find a network

I have bought a SIM800L module for sending SMS messages but for some reason it keeps failing.
The Network led keeps flashing approximately every seccond wich i think means that it searches for a network, which is weird because my pay as you go SIMcard has credits and I removed the PIN using a phone.
The AT commands responds:

AT+CPIN: READY
ERROR
AT+CPIN?
ERROR
AT+CFUN?
+CFUN: 1
OK
AT+CFUN=?
+CFUN: (0,1,4),(1)
OK
AT+CMGF=1
ERROR
AT+CMGS="XXXXXXXXXXXX"
ERROR
"TEST"

The module is connected as follows:

arduino>sim800l
5v>5vin
GND>GND
10>TXD
11>RXD