Reliance jio is one of the worthless phone which I have ever used in my lifetime.Only Jio sim is compatible with this phone, It does not allows you to use any other network sim card rather than jio.It has the worst keyboard ever.It will take 10× time than touchpad to type the same words.You will completely hate the phone just because of the keyboard.It has a very slow and laggy interface.Also its screen size is very small.This phone comes with 2000mah battery to support its 2.4 inch screen with QVGA display having a resolution of 240×320 167ppi, all these features are very disgusting.It has a very poor camera quality, with rear camera of 2mp and front camera of 0.3 megapixel it completly spoils your image.There is no "HOME BUTTON" for you to visit home directly. whenever you are using any application, you need to come back step by step by clicking the back button.You cannot lock the screen manually and instead it will be locked automatically if your phone is not in used for 60 seconds which is very annoying.Some of the limitations of Reliance JioPhone are as follows.
1) .You can only use preinstalled apps on the phone and will not be able to install any android apps or any other application because it is built on KaiOs.You can only download from JIO store where you can find only very few applications.
2) .It has a very low video quality.Its sound quality is even poor with unstable also.Sometimes, you gets an server error while browsing, even if you are connected to an internet connection.
3) .You cannot share your Internet connection As wifi hotspot and tethering is not available in this phone.
4) .This phone is very slow.It takes a lot of time to get it charged.Charging it completly can take more than 5hours.
5) .There is no whatsapp in this phone.sometimes you are unable to adjust the volume when you are watching YouTube.
6) .One of the major drawback of this phone is that is has only one single sim slot.
FROM MY PERSONAL EXPERIENCE I STRICTLY RECOMMEND NOT TO PREFER Reliance JioPhone.