SIM Registration Issue on Brand New Galaxy S25 Ultra

[iznyder]

I recently purchased the Samsung Galaxy S25 Ultra, and I am facing a serious SIM registration issue with both of my SIM cards:

BSNL (Primary) - Calls & SMS
Airtel (Secondary) - Data
After inserting both SIMs, the phone detects them, and I get network signals initially. However, the signals randomly disappear without any movement, and a "No Signal" icon appears. This happens frequently, making it difficult to use the phone for calls or data.

To rule out any issues with my SIM cards, I purchased brand-new BSNL and Airtel SIMs today, but the issue still persists.

Troubleshooting Steps Tried (None Worked)

• Switched between 4G/3G only instead of 5G
• Manually selected the network provider
• Reset SIM settings (Settings > General Management > Reset > Reset Mobile Network Settings)
• Restarted the device multiple times
• Factory reset the phone
• Replaced existing SIM to new ones 

Despite trying all these solutions, the problem remains. I would appreciate any guidance from the Samsung support team or community members who might have faced a similar issue. Is this a software bug, or could it be a hardware issue?

[garvitgoel_]

If it was software bug more people would have faced it
Better to go snd get it checked

[naviaz]

Wow that's happening to new S25ULTRA?
I too purchased one but mine is working well bro.
Sorry to hear about ur suffering!

[Wodehouse]

Your S25. it appears is not configured to read BSNL SIMs. Go to Samsung gallery.

If this reply answered your query please tap 3 vertical dots to the right of my reply and tap "Resolved". Thank you 😊

[naviaz]

A brand new phone purchased from India should be configured to read all networks.
That's what I think.

[naviaz]

When I bought S25ULTRA i was worried about transferring Airtel e sim.
But to my surprise it wasn't at all a tedious task.
Ofcourse banking apps worked only after 24 hours of e sim transfer.... Security protocol.

[lakshmipathy79]

Its bsnl friend..... their network is still has old hardwares. I have the same issue with Bsnl and Jio sim combination.

Moreover, after many people switched over to bsnl, citing the recent tariff hike, network is totally unstable in my region.

[goodthings]

Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also ✈️ mode on n off one time also restart your's device without any Sim in slots also interchange Sim in slots also turn off power saving mode also optimize your's device in device care too also clear catche of all apps manually then try to it's again. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.

[Babru]

Nice Shot To post in the Galaxy promotion section, please follow these steps: 1. Tap the three dots in the upper-right corner of this page. 2. Select Edit and choose 'Galaxy Promotion' as the section instead of 'Galaxy S'. If you find this helpful, kindly mark it as a solution to assist others: 1. Tap the three dots on my reply. 2. Select "Accept Solution." Thanks for your support!

[goodthings]

Your's most welcome to here.