LisaRus_2736797 no connectivity

LisaRus_2736797 Not nearly enough information to get useful replies I'm afraid.

Is your handset in flight mode, LisaRus_2736797? 

Do you have an active plan?

Have you checked for network faults in your area? 
Do this online at https://smarty.co.uk/network-status-checker.

Otherwise, contact SMARTY customer care online at https://smarty.co.uk/contact. The advisers work 8am - 8pm everyday.