my experience living few years using mobile internet as my main internet connection with digi i150, you will need to invest in a good modem. these days, i don't know what good 5G modem/router available. back then huawei was the best for 4G. need to make sure the data band is compatible and such.

1000GB FUP will be more than enough for regular internet browsing, streaming and occasionally download games. forget about competitive online games, because ping will be high.

your phone will be.... toasted. maybe need to have like a PC fan blowing some air on the phone if you're planning to have the internet on 24/7.