I think you're confusing "live feed" with cellular texting of pics.
You could do the live feed thing, would be spendy on many counts. The cellular cams like Covert Code Black are only as good as the cell coverage at your lease with either AT&T or T-Mobile, no others. Mine worked well for me.
M&P-10 - AAC Cyclone
ATN OTS 336-50mm 9hz Monocular
ATN NVM14 NV Monocular