how to activate iphone without sim card

i have an iphone six which has an imei corrupt so my network is stacked on (searching or no service) am able to use wifi for my whatsapp facebook and other things until yesterday i made a reset by erasing everything on the iphone , now am stacked at activating with sim card but here lies the case my imei is corrupt so my network does not detect any sim. is there anyways apple can help . even if am supposed to pay i dont want to lose this iphone .somebody help if there is a way please, thank you in advance