Dual Sim Issue S25 Ultra

[iamfromUAE]

I'm experiencing issue with Dual Sim. I'm based in the UAE and using two SIM cards on my Samsung S25 Ultra. The first SIM works perfectly, but the second one shows network coverage yet doesn't function properly. If I don't check it frequently, important SMS messages sometimes arrive a day late. To receive SMS or OTPs, I have to switch to airplane mode and back, which is really frustrating.

I previously used the S21 and never had this problem. Now I'm wondering why I upgraded to the S25,

Is there any known solution to fix this issue?

[Tourbillon De La Vie]

Is the phone purchased meant for UAE market 

[iamfromUAE]

Yes, i pre ordered directly from Samsung UAE

[Tourbillon De La Vie]

Try swapping the sim slots. Second sim into first slot. Clean the 2nd sum and if still not working contact network provider and ask for sim card replacement