In most cases, you should be able to make and receive calls. However the calls may be going through your old provider or blended calling since only one handset may be able to receive calls. *Both your old and new service providers’ handsets are partially active. *Both handsets may be able to place outgoing calls, but only one handset will be able to receive incoming calls. *We recommend you keep both your old and new handsets with you until the period of dual service has passed. *If your blended service lasts for more than 24 hours please contact our Customer Support