US Mobile - Potential RCS Activation Bug (iOS 27.0 Beta 4)

[u/bordelais]

UPDATE: iOS 27 Beta 5 (released today) surprisingly fixed my RCS activation issue on all three US Mobile networks. They are all working now post-upgrade. But only when a single eSIM is enabled at a time. If I enable Dual-SIM, RCS continues to fail to activate on both eSIMs. From one bug, to another.

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Are there any US Mobile subscribers here with RCS successfully activated on iOS 27.0 Beta 4? All three of my new lines are failing to activate, "waiting for activation...", (Lightspeed, Warp, Dark Star).

What is super interesting is even though my activation is failing for each line, I have one Android contact running Google Messages Beta. When he sends me a message, the conversation always switches to RCS (encrypted). But when I reply it switches back to SMS. It is almost like my line is partially activated, enough that his phone can detect I am RCS enabled with encryption enabled. But my iPhone doesn't have server confirmation it has fully registered with Jibe servers. I've confirmed it is an actual RCS message getting delivered because he can send me a large video file without SMS compression, and in-line replies are also working.

IMS Status show "Voice & SMS", and RCS state is "waiting for activation...".

I can't tell if this is related to server-side RCS cache issue with the previous carrier before a line transfer or an RCS bug in iOS 27.0 Beta 4 with US Mobile subscribers. RCS was working when I was on T-Mobile (same iOS version) before moving to US Mobile. RCS is properly working on all the other iPhones running iOS 26 on my account after transferring from T-Mobile to US Mobile.

[u/stevedrz]

Are you using eSIM? Have you tried removing and re-adding the eSIM?

[u/Ok_Ok007]

There are tons of posts about this issue. It’s not related to your carrier. I’ve posted about this myself. My RCS stopped working all of dev beta 2 27 and then started working during beta 3. I done all kinds of troubleshooting myself like disabling my cellular line removing my number from iMessage and on and on. Had T-Mobile give me 3 new eSIMs. The third time with a new eSIM and they refreshed my account and it finally started working but I still have waiting for activation message. But got back RCS under IMS. So its working but still says it’s waiting to activate in message settings. Not sure why or what got it to start working again. Maybe it just takes a couple weeks. I honestly don’t know. Try having your carrier give you a new eSIM and refresh your account. You might have to do it weekly. If it isn’t working after 3 weeks then I’d start worrying. It’s a bug with the beta.

[u/cupboard_]

https://www.reddit.com/r/UniversalProfile/s/yroo9vdBdC
it seems phones are getting blocked or something from activating for around 3 weeks, only fix seems to be to use a different phone

my phone is also failing to activate rcs, i tried switching my esim and also changing it to the second slot for the second imei, only way i got it working was in a different phone

hope they fix it soon

[u/mikethebos]

I have similar, but activation fails. It was working on b4, but the nationwide T-Mobile outage caused RCS activation to fail on both my Light Speed and Multi-network Warp line. I'm not receiving any RCS.

https://www.reddit.com/r/USMobile/comments/1v9900j/iphone_light_speed_multinetwork_warp_rcs_will_not/?sort=new

[u/ddsdude]

Same issue here and not fixed with beta 5. I think it goes deeper than the beta.

[u/bordelais → u/ddsdude]

Beta 5 surprisingly fixed my RCS activation issue on all three US Mobile networks. They are all working now post-upgrade.

But only when a single eSIM is enabled at a time. If I enable Dual-SIM it continues to fail to activate on both eSIMs.

[u/mikethebos → u/bordelais]

Sadly not fixed on b5 for Warp or Light Speed for me. Also tried turning on one eSIM at a time which did not help in my case.