MTNL Delhi Router reset

Messages
279
Location
Delhi
ISP
airtel
Can anyone help me my small brother accidently pressed the reset button on the router and now the internet light is not showing and ADSL is stable and the name of WiFi has changed to Mtnl and is locked I tried called 1504 but they don't pick please anyone help?
EDIT : So i managed to get back the settings and now its working on every device except my iPhone 5 and i don't know why can anyone help?
 
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