Oppo F1s 64Gb Mobile iam using this mobile since past 1 year it gives Amazing performance and Good Batter backup and the Excellent Camera it Gives 100% Clear Shots and the this Mobile in the 20k price range this mobile will be the most preferable and it gaves the 100% satisfaction other mobiles have also contains all features but the quality and performances are low when compare to Oppo f1s 4gb ram 64gb internall mobile.
It does not require additional memory because its internall memmory have 64gb and also we have a choice to insert the externall memory also if we requred to store large data.
Some mobiles have hybrid slot those are some un benfit then we insert only two sims are 1 sim & 1 memory but Oppo f1s have not hybrid slot it has to be insert 2 sims & memory also, this product will have less heating problems in my openion Oppo f1s is best smart phone in the range of below 20k.