Airtel inactive or bondo sim how to check

Airtel inactive or reactive  check:

•  many syetem have airtel inactive check
• dial *999# or
• *222*2# or
• go to sms or message option
• write just aritel num -- 016xxxx
• send-- 9000 numbar 
• ok
• internet balance  check *8444*88#
• free minit & sms - *778*56#
• balance check *778#