Apple has used Qualcomm chips for many years but began diversifying last year using Intel chips on iPhone 7 and iPhone 7 Plus. iPhone 8 and iPhone 8 Plus also use Intel and Qualcomm chips. In the US, AT&T and T-Mobile use Intel chips and Verizon and Sprint use Qualcomm.
According to WSJ, Apple's decision to stop using Qualcomm chips for devices in 2018 may change. They can move the house by June or 3 months before launching the 2018 iPhone as planned.
Apple and Qualcomm began to contradict them earlier this year, after Apple sued Qualcomm for $ 1 billion.