Correct AT Commands sequence for Quectel M95 GSM module

I have easily managed to connect the M95 GSM module to an Arduino and can communicate. I want to have a very basic way of posting data to a website from the Arduino. It seems the AT commands are suppose to be easy to use.

I can send basic commands like AT etc very easy and get the reply. Now I want to post data and it does not work. Here is the sequence I use, in Arduino code:

Serial.println("Talking to Modem: AT");
mySerial.println("AT");
delay(1000); 

// I get correct response: OK

Serial.println("Check if SIM is locked");
mySerial.println("AT+CPIN?");
delay(1000); 

// I get correct response: +CPIN: READY

Serial.println("Setting up URL");
mySerial.println("AT+QHTTPURL=31,30");
mySerial.println("www.somedomain.co.za/api/");
delay(2000); 

// I get response: OK. Not too sure if the /api/ must be in the URL

Serial.println("Sending Data");
mySerial.println("AT+QHTTPPOST=31,30,10");
mySerial.println("usersID=2");
delay(2000); 

// Get the response: CONNECT

Serial.println("Read Response");
mySerial.println("AT+QHTTPREADS=30");

// Get the response: CME ERROR: 3 (Cause for PPP/IP Stack)

I'm not too sure what next to do:

1. Why do I have to send string lengths before I post the URL? Why can't I just post the complete URL? Is there an AT command to just post an URL?