Selling my iphone 4 want to make sure it's safe

I'm currently selling my iphone 4 8GB Black on amazon. I deleted everything by hand, contacts, messages, photos, voice mails, etc. When I click on all of these categories nothing comes up and they're completely blank. The only thing left on it is my music, is it safe to sell it to a random person with the SIM card in it? I currently have the iphone 5 and that phone is no longer even connected to me but when I go into my contact in the top it says "my number" and it's actually my current number. Basically, I'm just mkinf sure that it's completely safe to sell this phone and the future buyer won't be able to retrieve any of my old information. I already did a factory reset and everything like that.

If you have done a factory reset, That should take care of it! I would recommend NOT selling it with the SIM card, as if the buyer has a SIM card, They won't need yours!

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