Issues with mobile data when both SIMs are enabled (A33 5G)

[mrfree]

I'm experiencing a peculiar issue affecting mobile data when both SIMs are active on my Samsung A33 5G. I'm running the latest available software (One UI 7 on Android 15).

Here's the rundown:

• The Problem: When both SIMs are enabled, SIM_1's mobile data becomes incredibly slow, with significant delays (5-6 seconds or more) for incoming traffic. This leads to app timeouts and makes even basic browse impossible.

• Observations: The mobile data icon suggests data is being sent, but the issue seems to be with receiving data.

• What Works:

  • If I use SIM_1 alone in another phone, data works perfectly.

  • If I disable SIM_2 on my A33, SIM_1's data connection functions without a hitch.

Has anyone else encountered a similar issue with their dual-SIM phone? Any insights or potential solutions would be greatly appreciated!

Edit: for the sake of clarity, when I say "enabled" I mean they they are both turned on in SIM manager

[mrfree]

I'm experiencing a peculiar issue affecting mobile data when both SIMs are active on my Samsung A33 5G. I'm running the latest available software (One UI 7 on Android 15).

Here's the rundown:

• The Problem: When both SIMs are enabled, SIM_1's mobile data becomes incredibly slow, with significant delays (5-6 seconds or more) for incoming traffic. This leads to app timeouts and makes even basic browse impossible.

• Observations: The mobile data icon suggests data is being sent, but the issue seems to be with receiving data.

• What Works:

  • If I use SIM_1 alone in another phone, data works perfectly.

  • If I disable SIM_2 on my A33, SIM_1's data connection functions without a hitch.

Has anyone else encountered a similar issue with their dual-SIM phone? Any insights or potential solutions would be greatly appreciated!

Edit: for the sake of clarity, when I say "enabled" I mean they they are both turned on in SIM manager

[keith30]

You can't run two sims together at the same time, you to enable what sim you want to use i.e for data or calls.

[Easty]

Ive got a sim & esim and data switching doesnt work , its supposed to use other sim if data not available but i always have to manually switch sims ? S24 ultra .

[Easty]

Also you used to be able to set calls , text & data sim settings separately, you can't now

[mrfree]

Hi there! Both SIMs can be enabled and thus ready to receive calls, for instance. Naturally, only one is used for mobile data. Not relevant, but in my case SIM_1 is set as default for calls, sms, and data.

Edit: for the sake of clarity, when I say "enabled" I mean they they are both turned on in SIM manager

[Vica23]

Habe ich auch beim meinem S25 Ultra,war afaik auch schon so beim S9+ . Wirklich auffälig ist es allerdings nur bei Speedtests wo auch zusätzlich das Mobilfunksignal sich reduziert. Dafür hatte ich bei einem anderen Hersteller Probleme mit 1 App im Dual Sim Modus. Dürfte wohl viel Arbeit sein für das Smartphone.