My gopro (newest version) keeps saying it has no SD?

It used to work, however i decided ti clear format, to delete the pics. Then, it started saying no SD. I tried doing something by connecing the gopro to my phone, but it refuses to connect by not going ahead after i press existing (wifi app thing). What do i do?

Also, i recently cracked my iphone 5s screen. How much do you think it may cost to fix it at a local store?

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