Let's say that someone has an iPhone and their provider is AT&T. Let's also say this this someone has a Raspberry Pi. This someone wants to connect their Raspberry Pi to their iPhone's personal hotspot without the IP address changing. The person thinks "Maybe I ought to call AT&T and see if they understand my weird request," but this someone also wonders if there is a more automated, AT&T-personnel-free way of requesting a designated IP address. Maybe someone here might have some suggestions.
This person would like to leave their iPhone at home in ON mode while charging and be able to VNC to the personal-hotspot-connected Raspberry Pi via Google Chrome's VNC add on remotely from a laptop.
As is commented below, there is an uncertainty as to which IP address vis a vis what device should be static. I would like to now incorporate this into my original question--albeit more implicit than explicit: Which is better? Would it be more ideal to have the iPhone's IP address static or the Pi's? Perhaps both?
N.B. - Please feel free to comment. I encourage bluntness, straightforwardness, and telling-it-straightness.