I have an iPhone 7. Model A it says o Sevice. I understand this is a factory defect. I purchased the phone Oct. 2016. . How doomi get it repaired?

It’s too late for Apple’s program shown here. This expired in October, 2020 in your case.

iPhone 7 Repair Program for "No Service" Issues - Apple Support

my iphone 7 A 1660 MODEL ALL OF SUDDEN SHOW NO SERVICE , I CONSULT APPLE SERVICE CENTRE IN JUNE 2021, THEY REPLY NOT POSSIBLE TO REPAIRE, NOW TODAY I SEEN THAT APPLE RUNNING PROGRAMM FOR IPHONE 7 FOR THIS SPECIFIC ISSUE. CAN I ELIGIBLE FOR THIS PROGRAMME

LD150 wrote:

sberman answered that above your post

That’s specific to the OP though, since it’s 4 years from the first retail purchase. There might be a little more time, since the iPhone 7 was available into 2018, and some retailers might have even sold them beyond the date Apple withdrew the iPhone 7.

sberman answered that above your post

Yes, this new questioner can read the blue link in sberman's answer and relate it to their own case.