What device you have you could just force the phone to stays connected to band 4 trough this might be a problem if you are on a deep building
I'm using an LG G6. This doesn't happen when I go indoors - as the signal does effectively drop and handoff to band 4 or 12 on a closer site because thtere literally would be 'No Service' vs. unusable weak service.
As Dragon1562 posts - and T-Mobile is aware of - this requires one of a few things to fix the issue until T-Mobile deploys band 2 on a closer site:
1. Toggle airplane mode
2. Disable VoLTE and force a call (which would force the phone to HSPA+)
3. Use field test mode to force the phone to HSPA+
4. Use field test mode to force the phone to band 4 or 12 only
5. Put cellphone into a faraday cage / shield it from 'weak' service which will force it to a closer site.
T-mobile is not the only carrier to have handoff issues. I live in State College, PA at the moment and all the carriers are bad at connecting to a specific tower. AT&T specifically is the worse with my Iphone 8+. However, I have also had issue with T-mobile at times wanting to insta lock to HSPA+ instead of the stronger LTE connection. It really is weird but usually a quick airplane mode cycle does the trick.
Well, it looks like T-Mobile is dropping the ball again. Their 'scheduled' upgrade appears to not exist any more, and I'm still with failed handoff in my area. Its 4 months now T-Mobile.
I've sent a letter to 'John' for an executive response. Worse case, I have the local engineer's number.
The temporary good news. John / Neville escalated to local RF team. I was able to speak with an RF engineer, and they were able to make some adjustments to allow for handoffs. It 'was' handing off at -118dBm, they lowered the threshold to -115dBm, and it made a world of difference.
Now, instead of having to wait until I go indoors for a handoff, it will hand off up to 2 blocks away, where streaming actually works, even if its not the greatest.
I actually ran a speed test at < 500' from my nearest site (has no band 2), and it handed off on the upload at 1 block away.
Download = 0.08Mbps, Upload = 25Mbps. Ping = 132ms, jitter = 873ms.
If they handn't tuned it... Upload would be at 0, and would stay this way until I forced handoff or went indoors.
This morning - same location (band 4/12 only), typical result = 104Mbps, 45.9Mbps ping 28ms, jitter 3ms
Official word is this site will be upgraded to add band 2 (10x10) by end of Q2. Should be able to hit ~150Mbps.
Glad to see progress was made and I actually experienced this issue for the first time. I had to call in to T-mobile to get my phone to fix itself since a simple restart would not suffice. T-mobile really needs to work on improving this across the board.
In my area it didn't happen all the time, but it did increase a lot depending on which sites had band 2 added, and it only happened it my phone was using band 2 as the primary... because my neighborhood's site lacked band 2.
This will 'eventually' disappear when the site is updated. It will be up to 2 more months before they complete. Since they have fixed the handoff issue by lowering the threshold, it'll do until they complete the upgrades.