Android apps: read this.
Sailfish OS is not Android, but an alternative OS descended from Meego Harmattan; fortunately it has a module (paid) to run Android apps.
This “Android-Support app” allows you to run apps in .apk format.
Whether it’s a mainstream Android app from Aptoide / Aurora, or whether it’s a FOSS app from F-Droid, you will need the License to run the app.
Visit shop.jolla.com to purchase one of the available licenses. The average price is usually around 49 euros, but Jolla makes discounts on some holidays during the year.
(At the moment it is not possible to buy license and phone together).
Native / “Pure” mode
If you already thought of staying Google-free, the basic version is fully working, with its native apps from Jolla Store and Openrepos.
Memory and storage
4 GB RAM
32 GB eMMC internal memory
Up to 400 GB microSD™ card
Google Android™ O -> Sailfish OS 3
Qualcomm® Snapdragon™ 630 Mobile Platform2
Qnovo™ Adaptive Charging
Quick Charging6 (Qualcomm® Quick Charge™ 3.0)2
USB power delivery
Corning® Gorilla® Glass 5
157 x 75 x 9.6 mm
6” Full HD+ 1080p
Image Enhance Technology
1/2.3” Exmor RS™ for mobile image sensor
84° wide-angle F2.0 lens
5x Clear Image Zoom
8 MP 120° super wide-angle
1/4” Exmor R™ for mobile for mobile image sensor
120° super wide-angle lens F2.4
GSM GPRS/EDGE (2G) 850MHz, 900MHz, 1800MHz, 1900MHz
UMTS HSPA+ (3G) H3413/H4413/H4493 Bands: 1,2,5,8
LTE (4G) H3413/H4413 Bands: 1,2,3,5,7,8,20,38 H4493 Bands : 1,2,3,5,7,8,28,38,39,40,41M
WiFi : IEEE.802.11a/b/g/n(2.4GHz)/n(5GHz)/ac
A-GNSS (GPS + GLONASS)3
Bluetooth® 5.0 wireless technology
High-Resolution Audio (LPCM, FLAC, ALAC, DSD)5
Bluetooth® 5 wireless technology, aptX / A2DP
Qualcomm® aptX™ HD audio4
2-way Style USB Audio & Bluetooth® Headset SBH90CStereo Bluetooth® Headset SBH24
Open-ear Stereo Headset STH40DAll the info there https://www.sonymobile.com/global-en/products/phones/xperia-xa2-plus/