GENERAL- What type of SIM is required for using myFirst Fone D3S?

You would need a nano sized SIM card that support 2G network with data and call functions.

Do check with the preferred local mobile network operator if SIMs are on the supported bandwidth.
As long as bandwidths between operator and watch are compatible, which you can check on https://www.frequencycheck.com/, it can be used with the local mobile operator.
Important note: myFirst Fone D3s supports Prepaid/Postpaid Mobile Smartphone SIMs.
- Smartwatch,Traveler,IoT,orany other special SIMsareNOT recommended
- For use withNano SIMcards
- Requires caller-ID for voice calls