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How to Change Your Primary SIM Card for Singapore M1 SingTel and StarHub Multi-SIM Card Users

If you’re like us and juggle between multiple SIM devices, here’s a quick reference guide to designate a specific SIM card as your primary SIM to calls and SMS to come through, you’d need to dial in the following into your phone depending on your telco in Singapore –

M1: Input *136# and press dial

SingTel: Input *141# and dial

StarHub: Input *118# and dial

Hope this quick guide was of help!