Sharing my experience here. I was using 2 old phone to tethering and hotspot. One spoiled around 6 months (Vivo) and another one spoiled within 1 year(Samsung). So i decided to get B618 last week. Let's see how long this 4G router last.

Not battery but the build in antenna? (not sure if it is call like this)
The Vivo early can always get 4G 4 bars. After some times, only can get H+ then totally no more signal.
The Samsung also same now, after around 1 year, it only can get 4G 3 bars and the speed drop many. I think it will end up like the Vivo, totally no signal if i continue using it.
I already tested the sim card with another phone which never use for tethering, no problem always 4G full bar so it is not related to telco maintenance.

Not really 24 hours but 90% of the time i am using as tethering because no Unifi here. Once you tried high speed, really hard to go back to the stupid slow Streamyx.

Ya the phones still working, only the signal become weaker days by days. Something related to the built in antenna i think.

Didn't know this before. Want to save money end up waste more money.

I see. Hopefully this B618 can last longer.

I only get 3 to 4 mbps today

I cannot reload with big pay since last 2 weeks. Anyone same?

Thanks sis.