Itr exemption with telephone bill and bill format

Question 1 : Is it only for postpad or we are allowed to submit prepad bill too ?

Question 2: If it is allowed to submit prepad bill too then are we allowed to submit bill invoices generated by third party recharge vendors like Paytm, Mobikwik and Freecharge etc.  

Question 3: If am not wrong these above invoices are nothing but e-bills ?

Question 4: If we can submit these bills then what all are the conditions?

Please, if anyone can clarrify me, I am new to these.

I am attaching an e-bill sample for the ref.

Thanks for your kind help!