Back up contacts to your Google account on Android
Sign in to the same Google account on the new phone
Turn on contact sync on the new Android phone
Back up contacts to iCloud on iPhone
Sign in to the same Apple ID on the new iPhone
Turn on iCloud Contacts on the new iPhone
Use Quick Start to transfer contacts from old iPhone to new iPhone
Use the Android Switch app to transfer contacts from iPhone to Android
Use the Move to iOS app to transfer contacts from Android to iPhone
Export contacts as a VCF file from the old phone
Import the VCF file on the new phone
Copy contacts from the SIM card to the new phone
Transfer contacts using Bluetooth if both phones support it
Use your phone brand’s transfer app, such as Samsung Smart Switch
Check the Contacts app on the new phone to confirm the transfer