US T-Mobile will end it’s 3G network soon. What that means is that 3G phone users will have to upgrade their phones to 4G to use the services including VoLTE voice calls.

In Singapore, the 3G networks spectrum rights will expire by end of 2021. Similar to T-mobile, existing 3G smartphones wont work and 4G phones without VoLTE won’t be able to make any voice calls.

Although IMDA specified that the 3G network spectrum rights will expire by end of 2021, it may not shutdown or even extend it for another few more years while deployment of 5G networks carries on.

Image may contain: text that says "1:40 4G+ LTE 28% Spectrum Rights Issued Expiry Date 3G Spectrum Right MobileOne Ltd (3G Spectrum Right) (35.34KB) SingTel Mobile Singapore Pte Ltd (3G Spectrum Right) f.k.a. Singapore Telecom Mobile Pte Ltd (3G Spectrum Right) 27KB) 公 31 December 2021 StarHub Mobile Pte Ltd (3G Spectrum Right) (35 .35KB) ectrum Right (2010) (3G Spectrum Ask Jamie"

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