I am going to share my experience of using Bharath 1 4G feature phone,
I use this phone for only calls and I always ON hotspot in this mobile I use internet in android mobile.
When I started to use this and airtel sim with 4g ON,
I use to face network problem, whoever calls me they were telling my number is not reachable,
I changed network to 2G/3G after, that issue solved,
I started using jio sim with 4G enabled, no problem with network,
If you are thinking to buy 4G feature around 2.5K₹,
This phone is good to use,
They have given a option of TV, but no option of much channels,
Battery drains fast,
Camera poor quality,
One good option is wifi Hotspot.( not available in jio phone) .
Typing text message would be difficult initially,
if friend or family member having more data any time but they do not use much then hotspot helps to us.
if you are using professional number, it is having lots of data but you cannot use in that mobile so you can add that sim in this phone and you can use hotspot.