maybe can try to find modem with phone port, like huawei modem. most of it have the port

I'm a satisfied Infinite 150 /B618-65D user except for the price. Went to TMPoint yesterday to sign up for Unifi Bebas. They checked my coverage and told me my area is not covered even with Unifi Air. I took a gamble and sign up for the RM10 Unifi Bebas package to try. Unlimited data for first month but speed is throttled at 7MB. Put the card into my Huawei E5186-22s, it couldn't connect. Put it into my Huawei B618-65D it worked at 4G+ and full bar signal as opposed to what TMPoint told me. Youtube and Netflix ran without a hitch. File downloading is never over 1MB. I guess they capped it. But at RM10 what is there to complain. When I put my Digi Infinite card into the Huawei E5186 modem I could only get 4G and not 4G+. Does E5186 support 4g+? I can get 4G+ when the card is in the B618.s
And I was thinking of giving the Unifi Air RM79 package a try and compare with Infinite 150. If I can get full 4G+, unlimited data and no speed cap, then can consider terminate Infinite as this would save me about RM70/month.

Phone as hotspot can be used for temporary solution only, better get a router even the basic one will do. Eventually your battery will bloat if long hours of usage.
I heard Huawei phones are good in pulling signal if you want to continue using it. Get a Cat 6 phone.

I'm using router with phone too. I'm using B618 and with VoLTE enabled, so I can plug in an external phone to chit chat while doesn't affect my Internet connection.

Is there any promo for new Digi Infinite no. now or if the MNP trick still works?

My 12 months x RM 20 rebate has expired last month.

I think only U Mobile can challenge them because it is unlimited.

Yes.

Not that I'm aware of. If it is Infinite 150, the hotspot quota is unlimited so not much a concern.