OnePlus 7T Android 12 (OxygenOS 12) update broke dual-SIM functionality (not working or won't detect) for a section of users

Compared to OnePlus 6T, its successor the OnePlus 7T was for sure an upgrade in terms of the phone’s display and size, battery life, and performance.

Recently, some of the carrier-locked variants of this phone have got the OxygenOS 12 update that also introduced Android 12. However, users are disappointed with the update due to some of the bugs it has introduced.

According to reports (1,2,3,4,5,6,7,8,9,10), multiple users are experiencing issues when using Dual-SIM functionality after the update to OxygenOS 12.

It is alleged that the phone cannot detect or read both SIMs together. The issue has been persistent for the past few weeks and remains unresolved until now.

This isn’t the best development for those who purchased the 7T specifically for its dual-SIM capabilities.

While it’s possible to receive calls even on the secondary SIM, reports allege that proper communication is still an issue. But surprisingly, the phone does not show info of the second SIM in the status.

Since the update it cannot detect the SIM card (T-Mobile, USA). Of course this means I cannot receive confirmation codes to log into my work today.
Source

New update OS 12 no longer reads dual SIM. Anyone having the same issue and knows how to sort it out?
Source

Users have tried rebooting their smartphones, swapping SIM slots, and factory resetting but with no success. Some are now even thinking of installing custom ROMs such as Pixel Experience (Android 13), or LineageOS 20 on their phones.

Fortunately, we did come across a potential workaround that may help solve your problem. You can try rolling back to the stable OxygenOS 11 release, but keep in mind downgrading to an older OS version will wipe your phone’s data.

So, it is advised that you take a backup of your important data beforehand.

Alternatively, you can try swapping SIM slots or make use of a single SIM on your mobile device until the issue gets resolved.

We do hope that OnePlus will fix the persistent bug soon.

That said, we’ll keep tabs on the issue where OnePlus 7T dual-SIM functionality is not working after OxygenOS 12 and update this article if we come across any new info.

Note: We have more such stories in our dedicated OnePlus section so be sure to follow them as well.

Featured image source: OnePlus 7T .

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