I'm in the midst of a 400A to 600A feed upgrade. It did require upgrading the meter base to a commercial grade CT cabinet. To find the physical space for it (it's large - approximately 4x4 ft and 18" deep), I had to move one of my heat pumps and our Verizon FIOS ONT.
When it's done, I'll have three 200A panels, and a fourth sub-panel at 135A. The two 200A panels are in the basement, and serve the house. One of these panels is fed via a transfer switch with a 18kW natural gas generator for backup. The 135A panel is located in the garage, and is a sub-panel of the 200A panel in the basement that is not on the generator. Lastly, the third 200A panel is fed from a separate meter (for TOU EV rate plan) and is in the garage.
I'll have two HPWC's at 80A (100A breakers), and a clipper creek at 25A (for a volt) which is being fed from the 135A panel. I did this because the volt has to charge twice a day, one of the times being outside of the TOU ultra low rate. When the day comes that the volt is replaced, probably with a Bolt or Model 3, I will likely re-wire the EVSE for that car to the 200A EV panel, and reduce the amperage on the HPWCs to accommodate.
I'm also in the midst of repricing solar. If I go forward, it too will likely go to the 135A sub-panel in the garage. There are a few other loads on this panel, one small heat pump and some LED lightning. I don't think adding the solar should be an issue, but we're using a panel rated for 200A even though the breaker is 135A.
Hopefully this wasn't too confusing.
Edit: We're drifting away from the original topic of phone app for the X. Mods feel free to move a few of these posts to charging .. Possibly a thread on how to wire your garage to support multiple EVs.