OPPO seems to have two new mid-range phones in development. The two phones have appeared on TENAA as the OPPO PBBM30 and the OPPO PBBT30.
The OPPO PBBM30 and OPPO PBBT30 share the same specs, so they are most likely network variants. They have 6.2-inch 1520 x 720 displays. TENAA says the processor in both phones is a 1.8GHz octa-core chipset paired with 3GB of RAM and 32GB of storage.
On the back of the phones is a 13MP + 2MP dual camera system while an 8MP camera sits in front. The cameras are arranged horizontally based on the images provided. The phones don’t have a fingerprint scanner but there should be Face Unlock.
TENAA reveals they run Android 8.1 Oreo but expect ColorOS on top. Under the hood is a 4,100mAh battery. There is also support for storage expansion (256GB max.). Both phones will be available in black and red. Their dimensions are given as 156.1 x 75.7 x 8.2 mm and they weigh 170g.
The specs of the phones are similar to those of the Realme C1, save for the front camera and the bigger battery, so the OPPO PBBM30 and OPPO PBBT30 might probably be the Chinese variants.