I was shocked when this happened to me. My 32K SIM was working fine until I moved to 64K SIM and all the problems began. Now the phone does not start with the 64K SIM. Now neither AIRTEL nor SAMSUNG are providing any solution. Either AIRTEL should keep the option of providing 32K SIM or SAMSUNG should provide software upgrade. At the Authorised Service Centre for SAMSUNG they are saying that no solution has been provided for this problem. Now I cant buy a new cellphone. So I guess I will have to change the connection which still uses 32K SIM or those whose 64K SIM are compatible with SAMSUNG.