In reply to Lankyman:
An option to consider is monthly contracts.
Lots of monthly sim only contracts nowadays which have the advantage of changing the package of data every month if necessary, say if you have or expect to have periods of lower or higher data needs than your norm.
Only disadvantages of using your phone I’ve found is the phone battery can take a hit acting as a hotspot, and some providers do not, or did not in the past, allow tethering or have/had some limits on it’s use. Maybe all changed in recent years - I’ve not kept up to date and stuck with the same provider for more than 5 years; monthly sim only though to have flexibility of changing package as and when needed. Works well.