iPhone 13 Pro Max TMo US 5G. Can’t hold signal

[Jumpie]

So I’m noticing on the 13 PM that using an eSIM is giving me worse signal than using a physical card. I’m on 47.5 profile. I was getting the UC and now just regular. It keeps switching all over the place from 5G SA to LTE.

 

[Banglazed]

Do you have a physical SIM in the device to test like an old SIM that receive signal or another active SIM card? I beta test the eSIM when it was out and I noticed this as well. Physical SIM had better signal and download/speed. I was not able to get short code and some apps shows no connection on eSIM. I thought about trying eSIM to see if it’s improved since then. I’ll follow this to see what others experience.

 

[Jumpie]

Do you have a physical SIM in the device to test like an old SIM that receive signal or another active SIM card? I beta test the eSIM when it was out and I noticed this as well. Physical SIM had better signal and download/speed. I was not able to get short code and some apps shows no connection on eSIM. I thought about trying eSIM to see if it’s improved since then. I’ll follow this to see what others experience.

I only had the one physical card. It’s deactivated now. So I’ll have to go and get a new one. I’ll hold out until tomorrow and see if this improves. If not, back to the physical one. When I did pop it in at first, it was good. Now I’m sorry I did this.
Looking at Field Test, it’s either SA 156QAM or NSA 265QAM or just LTE.

 

[Apple_Robert]

13 mini with eSIM on T-Mobile and haven't had any problems thus far. Speed has been good and signal hasn't been vacillating like the OP has experienced.

 

[Banglazed]

Did you check the device about settings to see if there is a carrier update? It would pop up if it’s available or do a network reset?

 

[Jumpie]

Did you check the device about settings to see if there is a carrier update? It would pop up if it’s available or do a network reset?

Yea, and nothing. I’ll try reset network and settings now and report back.

still no UC we shall see.

 

[Jumpie]

Here’s what I noticed. 12PM on iOS 15 modem is 2.09.10 but on 13PM iOS 15.1b1 modem is 1.13.00. Would it really go backwards?

 

[chabig]

Here’s what I noticed. 12PM on iOS 15 modem is 2.09.10 but on 13PM iOS 15.1b1 modem is 1.13.00. Would it really go backwards?

Sure. It’s a different modem, so the software versions are unrelated. By the way, a SIM is not a radio, and neither is software for the radio. The SIM just identifies you to the network.