@dobey I wanted to try a T-mo phone to confirm its just the CDMA versions but after a saga of talking to a lot of less-than-savvy-individuals (to put it politely), I gave up. Sold the device to a guy using it as a smart mouse-pad. I'm now using a new Note20 Ultra vanilla with the moon-shot hope of "someday."

As far as T-mo SIM cards, I never used a T-mo branded phone, but certainly did test 3-4 T-mo SIM cards. Never worked. Data was perfect. The phone would get auto assigned a temp zombie phone number during "activation" then never finish.

Interestingly enough, my old S5 which was a T-mo phone, using a Ting T-mo branded universal sim kept on working because it was activated long before the T-mo/Sprint merger. I was never a T-mo customer, only a Sprint customer with my Note4.

For giggles I tried a few cards from Ting on the Note4 as a test in comparison. It was blacklisted upstream for Ting (as they are a MVNO for both).

I don't recommend anyone trying it with anything T-mo unless the phone is branded to support VoLTE and is new (obviously not a Note4). Never-mind Note4 technically could use VoLTE (like the T-mo likely does by permission only upstream)...but it was a complete nightmare. Sad to leave this project behind...for now.

@moem Yes, USA.

Following the T-mo decision to arbitrarily kill off all new voice service activation for Note 4s in Jan. 2021, I'd love to have some detailed information on what carrier or MVNO and what type of SIM card people are using.

One user already posted that a new pre-paid sim card with AT&T worked with the Note 4 (though at the time of this post the port doesn't have completely audio call capability).

I used Ting.com for my own service while the family used Sprint. Ting no longer can activate the Note 4 due to the T-mo merger (their parent network).

Hello everyone,

As discussed in the Note 4 telegram group, do not buy SPRINT/T-MOBILE Note 4 devices with the intent to activate these devices with T-mobile with Voice services.

As some of you already know, I spent literally 15 hours of various attempts online, over the phone and in T-mo stores trying to activate my Sprint Note 4, including 6 different types of SIM cards both T-mo and Sprint branded "universal" variants.

Bottom line is this: T-mobile has intentionally nerf'ed the Note 4 (you can get data but no voice, ever, period) and voice will never work AND they don't know how to remove the device once its "activated." There are rumors that Verizon will also follow suit sometime in 2021 as 3G is dismantled.

I run unofficial LineageOS 14+ (formerly Cyanogenmod) on my device, a Samsung Tab S 8.4 LTE.

I have searched many hours over many years through untold XDA forums in regards to Ubuntu Touch but with the latest Unity8 news, there might be more hope for modifying the kernel (like Linuxium does for Baytrail tablets) to run full fledged Ubuntu but alas I have never found it. Android just works too well for the demands involved in doing so.

Technically from what I have scoured, the biggest hurdle is related to what is described as the lack ability to do a mount loop. There are a few poorly recorded YouTube videos but with zero documentation, years old now.

I was extremely happy to see the Note 2 being listed on UBports as a potential device...but I don't think it suffers the same issue as the Tabs.