I am not able to get this code work. the function gsmcall(); does not get called at all. Please help me rectify my errors.

#include <lpc214x.h>
#include <stdio.h>


#define PLOCK 0x00000400 // for PLL
#define THRE (1<<5) // Transmit Holding Register Empty
#define RDR (1<<0) // Receiver Data Ready
#define MULVAL 15
#define DIVADDVAL 1
#define NEW_LINE 0xA // Character for new line, analogous to '\n'
#define ENTER 0xD // ASCII code for ENTER


void sysInit();
void gsminit();
void gsmcall();
void string_0(unsigned char *);
unsigned char gsmrec();
void delay(unsigned int);
void eval(unsigned char, int);
void initClocks(void);
void setupPLL0(void);
void feedSeq(void);
void connectPLL0(void);


int main(void)
{
      int flag=0;
       unsigned char ch1='\0';
       //initClocks(); // Set CCLK=60Mhz and PCLK=60Mhz
       sysInit();
       gsminit();
       gsmcall();
       delay(5000);
       ch1=gsmrec();
       delay(50000000);
       if(ch1=='\0')
      flag=1;
       eval(ch1,flag);
       return 0;
}


void sysInit()
{
       PINSEL0 |= 0X00000005;
       PINSEL1 = 0x00000000;
       IO1DIR = 0xFFFFFFFF;
       IO1SET = 0xFFFFFFFF;
       U0LCR  = 0x00000083; //8-bit data, no parity, 1-stop bit   
      U0DLL   = 0x00000061;  //for Baud rate=9600,DLL=82   
      U0LCR   = 0x00000003;  //DLAB = 0
       //U0LCR = 3 | (1<<7) ; /* 8 bits, no Parity, 1 Stop bit | DLAB set to 1  */
       //U0DLL = 110;
       //U0DLM = 1;  
       //U0FDR = (MULVAL<<4) | DIVADDVAL; /* MULVAL=15(bits - 7:4) , DIVADDVAL=0(bits - 3:0)  */
       //U0LCR &= 0x0F; // Set DLAB=0 to lock MULVAL and DIVADDVAL, BaudRate is now ~9600
}


unsigned char recch(void)
{
       while( !(U0LSR & RDR ) ) // wait till any data arrives into Rx FIFO
          {;}
       return U0RBR;
}


void gsminit()
{
       unsigned char rec=0;
       while(1)
       {
        string_0("AT\r\n");
        rec=recch();
        if((rec=='0')||(rec=='K'))
        {break;}
       }
  string_0("AT+IPR=9600\r"); // AT COMMAND FOR BAUD RATE
       delay(2000);
       string_0("AT+CREG?\r\n");
       delay(2000);
       string_0("AT+CMGF=1\r\n");
       delay(2000);
       string_0("AT+CNMI = 2,1,0,0,0\r\n");
       delay(2000);
}
void gsmcall()
{
       string_0("ATD+919757257894;\r\n");//AT COMMAND FOR CALL DIALING
       delay(2000);
}


void sendch(unsigned char ch)
{
       while ( !(U0LSR & THRE ) )
       {;}
       U0THR = ch;
}


void string_0(unsigned char *str)
{
  unsigned int i=0;
  while(str[i]!='\0')
  {
  sendch(str[i]);
  i++;
  }
}


unsigned char gsmrec()
{
  unsigned char chh;
  string_0("AT+CMGD=1,4\r\n");    
  string_0("AT+CMGR=1\r\n");
  delay(2000);
  chh=recch();
  return chh;
}


void delay(unsigned int n)
{
        int i,j,c=0;
       for(i=0;i<n;i++)
       {
              for(j=0;j<n;j++)
  { c++;}
       }
}


void eval(unsigned char ch, int flag)
{
       if((ch =='s')||(ch=='S')||(flag==1))
       {
  while(1)
  {
        IO1SET = 0xFFFFFFFF;
         delay(2000);
         IO1CLR = 0xFFFFFFFF;
         delay(2000);
               }
}
               else
{
                     IO1CLR = 0xFFFFFFFF;
}
}
void initClocks(void)
{
  setupPLL0();
  feedSeq(); //sequence for locking PLL to desired freq.
  connectPLL0();
  feedSeq(); //sequence for connecting the PLL as system clock


  //SysClock is now ticking @ 60Mhz!
   
  VPBDIV = 0x01; // PCLK is same as CCLK i.e 60Mhz


  //Using PLL settings as shown in : www.ocfreaks.com/.../
  //PLL0 Now configured!
}

//---------PLL Related Functions :---------------

void setupPLL0(void)
{
  //Note : Assuming 12Mhz Xtal is connected to LPC2148.


  PLL0CON = 0x01; // PPLE=1 & PPLC=0 so it will be enabled
  // but not connected after FEED sequence
  PLL0CFG = 0x24; // set the multipler to 5 (i.e actually 4)
  // i.e 12x5 = 60 Mhz (M - 1 = 4)!!!
  // Set P=2 since we want FCCO in range!!!
  // So , Assign PSEL =01 in PLL0CFG as per the table.
}


void feedSeq(void)
{
  PLL0FEED = 0xAA;
  PLL0FEED = 0x55;
}


void connectPLL0(void)
{
  // check whether PLL has locked on to the desired freq by reading the lock bit
  // in the PPL0STAT register


  while( !( PLL0STAT & PLOCK ));


  // now enable(again) and connect
  PLL0CON = 0x03;
}