Send information to M5100B-D

Using Arduino Networking, Protocols, and Devices
4

I have managed to piece this sketch together

#include <SoftwareSerial.h>
char incoming_char=0; //Will hold the incoming character from the Serial Port.
SoftwareSerial cell(2,3); 
void setup()
{ 
  Serial.begin(9600);
  cell.begin(9600);
 Serial.println("Starting SM5100B Communication...");
 delay(35000); // give the GSM module time to initialise, locate network etc.
 // this delay time varies. Use example 26.1 sketch to measure the amount
 // of time from board reset to SIND: 4, then add five seconds just in case
}
void loop()
{
  cell.println("AT+CCED=0,2");
   //If a character comes in from the cellular module...
 if(cell.available() >0)
 {
 incoming_char=cell.read(); //Get the character from the cellular serial port.
 Serial.print(incoming_char); //Print the incoming character to the terminal.
 }
  //If a character is coming from the terminal to the Arduino...
 if(Serial.available() >0)
 {
 incoming_char=Serial.read(); //Get the character coming from the terminal
 cell.print(incoming_char); //Send the character to the cellular module.
 }
 delay(20000); // wait 20 seconds.
}

I believe this should work (not really) when I upload this and run the serial port the text prints into the serial port letter by letter with 20sec delay. What I need is for this part of the code

//If a character comes in from the cellular module...
if(cell.available() >0)
{
incoming_char=cell.read(); //Get the character from the cellular serial port.
Serial.print(incoming_char); //Print the incoming character to the terminal.
}
//If a character is coming from the terminal to the Arduino...
if(Serial.available() >0)
{
incoming_char=Serial.read(); //Get the character coming from the terminal
cell.print(incoming_char); //Send the character to the cellular module.
}
delay(20000); // wait 20 seconds.
}

to be constantly looping while the other part at a much slower rate.

A loop in a loop? is this possible?