S25 ultra

Thank-you for letting us know this in advance.  I was going to trade-in my S21 Ultra (Xfinity) for an S25 Ultra (Unlocked) at the Samsung website and then put it on Xfinity mobile (replacing the S21 Ultra).  But now, that doesn't seem like a smart thing to do, since the S25 Ultras are arriving before Feb 7th.

Wouldn't have been easier to trade in my S21 directly with Xfinity, but you have to commit to 2 years with Xfinity, and the website dropped my S21 trade-in value after placing it in the shopping cart to purchase the S25 Ultra.  Very deceitful.  A weekend of research is before me.  Thanks again!

@user_rpqpsb​ I'm having the same issue. I decided to go unlock with Samsung because I'm going to start getting all my devices from the OEM I'd rather have an unlocked phone to be stuck with Xfinity I've been with them for 8 years. And I'm thinking about switching all my phones over to T-Mobile because I checked my IMEI with T-Mobile and the phone will work over there with no problem

I started with X mobile back with the iphone 12 came out I had three lines since 1/2024 I left and went US mobile $25 a month  best decision I ever made. Now me and my wife both ordered the S25 ultra from OEM. I activated my S25u via esim and my wife's who is still on xfinity mobile I could not do the same. I am either going to grab a physical sim or bring her line over to US mobile as well

Did you try just moving the SIM from your S24 to your S25 (assuming it was Xfinity)? 

I went to the store on 2/6/2025 to tried to get a SIM card.  The verification process is such a pain when it doesn't work.  I showed my ID, my current phone with the service active.  Then they ask me to put in my SSN and DOB on a tablet.  It keeps saying my SSN and DOB is wrong.  They called tier 3 about my problem and made me put in my DOB and SSN on the phone and still failed the check.  I wasn't able to get the SIM card and wasted 2 hours at xFinity store.  It's very frustrating.  This might be the updated workflow to prevent SIM/eSIM swapping from happening.  I must'ved submitted my SSN and DOB working on activating my S25 Ultra the past few days like 10+ times and it worked once to my surprise.  The time that worked was through chat agent. Didn't resolve anything as they said eSIM activating is not available yet until 2/8/2025 and told me to check back again then.

It's 2/7/2025 right now and I still can't activate eSIM through the xFinity app.  Keep saying my phone is locked to the previous carrier when my phone is Unlocked.

Thank you for your feedback, user_b4xypw. The verification process will hold you back if it's not completed. To be sure I understand, is everything supposed to be resolved by the 8th?

@XfinityThomasA​ That's what the agent in the chat told me.

And this is why this is my last year with Xfinity Mobile, I have decided that I'm going to get a locked phones moving forward but this right here tells me to Xfinity really wants you to get the phone through them so you can be stuck with them for 2 years and I don't want that. Granted I've been with Xfinity mobile since 2017 and have ran into lots of issues when it comes to upgrading new phones and I'm just over it

They could solve it by activating physical sim and send it to customers meanwhile, if eSIM is not an option.  Unfortunately they can't even do that. We are all suffering because the way their system is designed.

@bulldog4791​ In the xFinity app, did you locate your existing device?  Under there, there should be a switch device option.  After you put in the IMEI it would say something along the lines congratulations and activating.  Before 2/8/2025 it was saying my device was locked to the carrier.  After this part it's not intuitive on what to do next.  Just says to installed the xFinity app, which I already did, so it was confusing.  In order to activate your device from the app, go to Account and then go through the "Activate Mobile Device".  Your S25 Ultra should appear here as an option.

Thank you for reaching out. I am sorry you are having this issue @bulldog4791 Have you activated the phone through these other providers and they were successful in activation?

@mdelcoll​ I can confirm that activating your s25 ultra can be activated, on the website it will or may show not compatible but when you actually go to a store or call in and place the order to update your phone there are no issues.

Thanks for the response. However, where are the Xfinity Mobile employee(s) confirming this? There are many other users stating this is not the case. 

Thank you for reaching out to us @mdelcoll! I can understand wanting an official answer that doesn’t involve checking the IMEI. Although, checking the IMEI is an essential requirement to check if a device is compatible with the Xfinity network. 

For more information on bringing your own device to Xfinity Mobile we have this dedicate article here.

Alternatively, the Samsung Galaxy S25 Ultra is available for sale.

Thanks but this response, clarifies nothing… the question still remains, and there is still no official response from Xfinity Mobile whether or not they can activate an unlocked Samsung S 25 Ultra 1TB purchased elsewhere since Xfinity Mobile does NOT sell the 1 TB model and only sells the  S25 Ultra 512GB & 256GB models… 

Please confirm whether or not Xfinity Mobile has successfully activated any BYOD unlocked Samsung S25 Ultra 1TB models Yes or N?  Thx

This is not something I am able to confirm on my end. I recommend starting by checking the IMEI to ensure your device is compatible.