Back up contacts to your SIM and your OPPO R15 Pro Android 8.1 -
OPPO Care - Changing SIM card without losing contacts? Always a win to know 📞🗃 Transfer SIM contacts to your OPPO in a few taps 🔄 Here's how: 1️⃣ Open the [Phone]
4 Workarounds to Copy Contacts from iPhone to SIM
How to Copy Contacts on OPPO A17 - Import Contacts From SIM Card - YouTube