While we already mentioned the divide between the regular iPhone 15 models that are likely to use a slower chip, and the Pro versions with a faster, Apple A17 Bionic chip, there is one thing that all four models might share: the modem.
Expect to see the same Qualcomm made modem on all four iPhone 15 devices. Apple has had a frenemy status with Qualcomm, and it tried to break free and develop its own modems, but analysts claim that has proven to be more difficult than expected, so Qualcomm it is.
Another tipped upgrade is a jump to 8GB RAM for the Pro and Ultra models, while the 15 and 15 Plus are likely to keep on using 6GB of RAM.
Satellite connectivity made a debut on the iPhone 14, and we expect Apple to have worked out the kinks of the technology and for it to work even better in iPhone 15.