@mrmehmoodshahid , just to add to what @bristolian has written, if you are on contract, please make sure that you have roaming activated on your account, not necessary if on pay as you go, as it is automatically enabled.
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.
