Use an app like zFont 3 from the Play Store. It allows you to upload a custom TTF file and apply it via your phone’s theme engine (works well on Samsung, Vivo, and Oppo).
The font is proprietary software owned by Apple Inc. While downloading TTF versions for personal use is common in the customization community, using them for commercial products (like an app you're selling) can lead to licensing issues. ios emoji font ttf download top