MEGA and SIM900 ERROR when trying to post using "AT+HTTPACTION=1"

I have a SIM900 module connected to an Arduino MEGA, everything works fine except when I try to make a post request, it keeps showing ERROR after the AT+HTTPACTION=1 command is executed, by the SIM900 manual that ERROR message is related to "Mobile Equipment functionality". It worked perfectly but now it keeps showing that annoying ERROR.

This is my code: (I put a fake server address but mine works fine, I have tested it with postman)

void gprsSetup()
{
  Serial.println(F("Initializing GPRS module"));
  delay(1000);
  Serial1.flush();
  Serial.flush();

  Serial1.println("AT+CGATT?");                    
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.println("AT+CBAND?");                   
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                    

  Serial1.println("AT+CBAND=\"ALL_BAND\"\r\n");        
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.print("AT+CGDCONT=1,\"IP\",\"internet.movistar.ve\",\"\",0,0\r\n"); 
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.println("AT+CGDCONT?");                  
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.println("AT+IPR?\r\n");                  
  delay(1000);                                     
  toSerial();                                     
  delay(1000);                                      


  Serial1.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"\r\n"); 
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.println("AT+SAPBR=3,1,\"APN\",\"internet.movistar.ve\"\r\n"); 
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+SAPBR=1,1\r\n");             
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+SAPBR=2,1\r\n");              
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+CSQ\r\n");                   
  delay(1000);                                     
  toSerial();                                      
  delay(1000);                                     

  Serial1.println("AT+SAPBR=2,1\r\n");              
  delay(1000);                                     
  toSerial();                                     

  Serial1.println("AT+HTTPINIT");                 
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+HTTPPARA=\"CID\",1");        
  delay(1000);                                     
  toSerial();                                      


  jsonWriting();
  delay(3000);

  Serial1.println("AT+HTTPPARA=\"URL\",\"http://myserverthatworks\"");        // not my real server address 
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+HTTPPARA=\"CONTENT\",\"application/json\"");        
  delay(1000);                                     
  toSerial();                                      

  Serial1.println("AT+HTTPDATA=" + String(sendtoserver.length()) + ",10000");        // Server
  Serial.println(sendtoserver);
  delay(3000);                                     
  toSerial();                                      

  Serial1.println(sendtoserver);
  delay(1000);
  toSerial();

  Serial1.println("AT+HTTPACTION=1");
  delay(3000);
  toSerial();

  Serial1.println("AT+HTTPREAD");
  delay(2000);
  toSerial();
  delay(2000);

  Serial1.println("AT+HTTPTERM");
  delay(3000);
  toSerial();

}

And here's the output

code output

Use this command

 Serial1.println("AT+CMEE=2\r");   // Enable +CME ERROR: <err> result code               
 delay(1000);                                     
 toSerial();    

and use verbose values so your module won't respond with a simple "ERROR" string but will tell what is the exact problem. The do:

 Serial1.println("AT&W\r");   // save to be persistent after a reset               
 delay(1000);                                     
 toSerial(); 

Then when calling

 Serial1.println("AT+HTTPACTION=1");
 delay(3000);
 toSerial();

Youwill get the error - most likely with sim900 this will be

CME ERROR: 4    Operation not supported

meaning you have to send the strings via TCP/IP and using

  Serial1.println("AT+HTTPACTION=0");

If you get

CME ERROR: 3    Operation not allowed

your network operator does not allow this same as with not supported if

 CME ERROR: 30  No network service

up to 40 are network issues you can not influence and errors between 41 and 50 are missing pins,puks, passwords etc. If you have any othererror message edit your question and I'll try to help