Pacemaker patients really suffering from mobile phones are very rare unless the phone is just positioned in the pocket over the pulse generator. The portion of patients really suffering from mobile phones is about 1 out of 100,000.  We do have customers with pacemakers that are using the Assure watch for over 1 year.
Nevertheless, as the Assure is a mobile phone, we cannot guarantee it so you would need to get confirmation from the wearers doctor if they can use the their pacemakers with immunity against mobile phones /our Assure watch phones as guaranteed by the pacemakers manufacturers.