If you have multiple family sims with a monthly data allowance in a group plan, some sims may run out of data while on other sims, there is remaining data. Please allow group data allowance to be sh...
This should be easy enough to do.
”US Mobile” in the USA do it.
From their website :
Shareable Data
Share data across multiple lines, including tablets
First line included. Add more lines for $8/line
Unlimited Talk & Text. on every line
Top up data any time for $2/GB; unused top-ups roll over
5G mmWave & C-band and Premium data
Int’l Calling & Texting*
Hotspot included