no serial number and stuck on activation

Hi there people,

got an iPhone 5c which doesn’t want activate it gets signal etc. But it just don’t activate tried plugging to iTunes etc. Still no luck. I pressed the little blue i button in the right corner realised there’s no serial number shown. Imei and the meid is shown.

would this be baseband issue? Also does any one know any fix for it. I have tried flashing the device but that didn’t work.

Any help appreciated.