The phone probably got broken ): if you saw any damage on the charging spot. Check inside of the charging area because yesterday I noticed a small piece of tissue that would sometimes prevent my phone from charging, and I had gotten it out with a small tootpick. The outlet, block thingy, or the cord could be the problem, if you haven't, try using another outlet, block thingy, or cord and see if it works. If none work, than your iPhone is probably broken and you might have to get it repaired somewhere but on this very website, there are ways showing you how to repair any iPhone by yourself, noy going anywhre. They have all the iPhone reapairs up to iPhone5C, the newest one. so, good luck, i hope your iPhone gets fixed.
It depends what type of speaker. IF you are trying to buy a stereo speaker for like music, you could go to Best Buy. If you're trying to buy a car speaker, the best place would be Pep Boys Auto Parts & Service. If you're trying to buy headphones or something, Best Buy would be the right place.
There is a small button, next to the camera. Use a small safety pin or anything small enough to fit in the hole, (sewing needle), and poke it in the hole and it will be reseted. However, your iPod or iPhone must be FULLY CHARGED, in order for this to work. Thank you, and I encourage you to try this, because it worked for my iPod touch 4g.