[Resolved] Vivo Mobile India — vivo mobile handset problem, as you can see the screen record pls

I bought this phone 2weeks back. From the date of purchase im not getting any signal when the phone is locked. When i unlock the phone it gets the signal back to normal, it even displays* no sim card also when locked. I am missing many messages and calls from the poeple.. I went to service center they did software but not solved the problem.. Please solve my problem i broughy this phone due to good reputation of vivo company only... I hope u understand my severity of my problem..