Can't read sms using Thinker A7 communicate with Arduino

hi guy

i'm trying communicate ai thinker a7 module. on arduino uno r3 im using pin 7,pin 8 connect utxd & uaxd. when send sms phone module thinker 7, use arduino read sms.
my code bellow

code: [select]


#include <softwareserial.h>
#include <string.h>
char incoming_char = 0;
softwareserial cell(7, 8); //my shield uses these pins software serial.

void setup()
{
 serial.begin(115200);
 cell.begin(115200);
 delay(2000);
 serial.print("starting modem communication...");
 delay(12000);
 serial.print("ok\nintroduce @ commands:\n");
}

void loop()

{
 if(cell.available() > 0)
 {
   incoming_char=cell.read();
   
   if(incoming_char=="a"){
     serial.println("content of sms a"); //if sms contains "#" arduino looks commands follow.
     serial.println(incoming_char);

   }
   else
   {
      serial.println("difference a");
      serial.println(incoming_char);

   }
 }
}



but can't read sms when phone send sms. check on serial monitor. result same picture attached bellow


please me fix it. lot

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