When you dial a telephone number from a roaming GSM handset equipped with the iR1 SIM card and press SEND, the iR1 SIM card signals its home GSM operator (i.e. the operator that issues the iR1 SIM card) to do the following: (a) to call back the roaming GSM handset to the telephone number that is assigned to the roaming GSM handset by the foreign (local) GSM operator of the GSM network servicing the GSM handset. (b) to call the destination number that you have dialled. and then bridge (or connect) the 2 calls (a) and (b) to enable you to have conversation with the party at the destination number. The operation described in (a) and (b) above is transparent to you, the user, and you do not experience any significant delay in making the call. As the call is dialled by your home GSM operator through its normal high-quality carrier network, you would experience the normal high-quality service.