dont need full bar to wi-fi hotspot. the stronger 4G signal, the faster internet speed
connect usb cable and use usb tethering

JLA, thank you of your information, I still not try it. Thank you.

Thank you so much of your info, you teach me new thing, I really appreciate of this!

I test both, when phone able internet then connect usb line to computer, just speed reduce some, but ok, at least can internet.

After this I still test of my hotspot, but still show "Limited".

Do you agree or any suggestion?
This unable connect long time up to 8 hours, because the phone will damage? The phone connect usb can treat like a modem?
The phone will not damage, but the phone battery will damaged? Always charging till full 100% still charging battery?

I still wish can use "hotspot", because no need connect usb, so I turn try bluetooth, but my computer bluetooth look like problem, unable scan the bluetooth devices, maybe my driver is old version, I unable fix my computer driver problems.

Any item in the market? It can put tm unifi sim card use mobile data or/and use wifi data plug the computer but this item not need charging battery or can like a modem plug with adapter without battery?

Thank you.