Will warranty for my iphone work if I can't provide receipt?

My one year warrantee still works for my iPhone 4S and I was wondering if they would need to see a receipt or something? Is it easy as just calling them, explaining that my phone is defective because my Wi-Fi does not work and the option to use Wi-Fi is greyed out and they check the serial number or something and see that I'm good and I send my phone in and bam they fix it?

It should be fine, I hate apple as a company but their customer service is one of the best. I have known people to go with broken screens and get a replacement!

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