For shutterbugs, the Oppo R15 houses a 20-megapixel front-facing shooter which can be used for capturing selfies and making video calls. At the back, the smartphone hosts dual 16+5-megapixel primary sensors which along with a dual-tone LED flash is designed to capture images and videos in both bright and dark conditions. For storing data and apps, you get 128GB of onboard storage space which you can expand further using a microSD card up to 256GB. Unfortunately, there isn't any dedicated memory card slot, and one has to rely on the Hybrid SIM slot.
Method to
recover messages from oppo r15 [samsung-android-transfer.com]:
You can use Android Data Recovery to recover deleted Whatsapp messages, text messages, photos, videos, contacts, call logs, music, books and other document files from oppo r15
and other Android mobile phones.
More info:
Recover Deleted and Lost Data from HTC 10 [samsung-android-transfer.com]