And how have you communicated?
Btw,I really don’t think this is a necessary step.I always skip it 
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but then how to do phone verification it required sdk setup
This isn’t phone verification! This just a step to check you’ve installed firebase correctly.And as koidular install it automaticly, you don’t need this step.
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i have made a app where i login , i think this will lead to communicate to firebase server
Nope , see this:
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okay let me try phone verification anyway thank you for your support 
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Well you just need to:
1- skip this step
2- go to firebase authentication section
3- enable phone verification.And you’re done!You can see this guide as well:
You can see this guide, you need to check your blocks.
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i have checked my blocks everything is ok but otp did’nt send
Use the sign in failed to debug your blocks
no message came
No error message came?
Blocks are correct you must take look at number you using their should not be any space and also check the JSON file you uploaded is correct if these were correct then you will definitely received otp
Everything is ok but otp didn’t send
It’s will be more helpful if you can share a video of what’s happening when you install and try the app
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The App Is Not Having The Permission Of Sending Messages…So Go To Your Mobile’s Settings And It The Apps Section Open Your App And In The Permission’s Section Allow The Permission…Hope It Works… 
I have tried all things when I am using test number which I have added to firebase it is accepting the test otp but not sending otp
actually firebase google services.json file format changed… thats why its not working in proper way… enable google auth and then try … its work only for 1st app… second one added app will not work for otp