Hello @Ahtisham1 ,
Welcome to the community,
The app is working for me, it may have been down for maintenance, as that is when they do it at night when less customers are online, rather than during the day, when businesses and customers are more likely to use it.
Is it now working for you, are you able to log in via the website to your account?
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using Skype or another phone: +44 800 079 8586 or +44 800 956 6000.
