GENERAL-Can I use the SIM card for other smartwatch or mobile phone? myFirst Support May 31, 2023 04:07 No, the SIM card is only allowed for use on the myFirst Fone S2 or myFirst Fone R1/R1s that is provided by myFirst. Related articles SIM card GENERAL-Which service provider do we work with for this subscription? How do I change my card details for the monthly subscription? GENERAL- Can I use a different sim card when travelling abroad? Network Issue