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Hello Kamesh. What smartphone you use?
If it's a Samsung S7 there is no need to buy cam for vlog.
Cheers

bro i am using Redmi Note 4

For starting is fine. Better invest in a mic "RØDE VideoMicro " and maybe a stabilizer (gimble) best from DJI. After some sucess you only upgrade your phone and you are good to go buddy! Is lightweight, modular and reliable.