https://youtu.be/MjvWoPbZDFU

this video explain what can u do to check & what can u do if u get telco lock phone.

tldr:
>ask for receipt
>check with Apple the serial number. whether it's telco phone or retail set

best way to get rid of telco lock issue is to sell it to Singapore / Thailand (other country). coz the telco lock is only for Malaysia sim (any sim). it will still work outside of Malaysia.

oh yeah, just noticed it too. there's a check service by shopee seller. but I still think it's better than asking for receipt since nowadays so many people can photoshop fake various receipt including fund transfer receipt.