1. You can sign up by using through mails or mobile number. If you want to sign up by mobile number just enter your received OTP and you can able to post free ads after verify it. 
  2. Yes, You can completely post free ads in any category in our website. But before that you have to sign up for a one time listing fee either in 6 month (i.e INR 99) or 1 year listing fee ( i.e INR 399). You can make payment through credit/debit card by Visa/Master card only. After payment you can post free ads on Etacky.com. You can pay through PayPal also. 
Etacky is a best free directory listing and free classified sites in india. Free responsive ads posting site in India.