Absolutely, positively, 100% scam. The fact he was offering MORE than your Buy it Now price should have rung alarm bells, which it did.
Sadly, electronics are a target for scammers. Anyone who wants something sent to Africa is most definitely a scam, regardless of what it is. If you had a phone listed, you would probably have received a similar offer.
Your gut was right. A huge pat on the back to you for seeking help before you had committed to anything. Especially as the 'buyer' would have insisted you post before you got paid.
Good luck with selling it. I would be surprised if it didn't sell, especially with all the extras thrown in.
Edited to add: Do you know how to block buyers? Up the top of any eBay page, click on where it says 'G'Day <your real name>', then click on account settings. Then click on 'site preferences'. Scroll down to 'buyer requirements', click show, then edit. Right down the bottom of that screen is a link to add buyers to your blocked list.
When you've added that buyer, click the back button and set up other blocks on that screen. Most as self explanatory. Have those blocks set can save heartbreak at times. Most importantly, set up the block to block buyers who have unpaid strikes against their name (set it to 2 in 12 months) and also the one where you block buyers who haven't gone through phone verification.
If you need more help, sing out.
