There are many models of oppo smartmphones but I found some of them are very costly.Oppo f7 4GB ram is a good smartphone among them.It comes with 25 MP front facing camra with AI beauty technology and 16 MP rear camra. I found that oppo has the good camra in their all models.Screen is 15.8 centimeters ( 6.23 inch) with 2280x1080 pixels resolution which is not bad.U can get this smartphone with android v8.1 Oreo based on color OS 5.0 operating system with 2GHz MTK 260 octa core processor which is the latest one.And its RAM is 4 GB with 64 GB internal memory. You may insert the external memory upto 256GB.The battry is 3400mAH lithium-ion which is not bad.The dual sim slot is 4G+ 4G, you can keep two 4G sim.Overall it is a good smartphone.