My iPhone is doing weird things

So lately, whenever I try to tweet with emojis, it won't send saying there's a "connection problem" but then I figured out when I take the emojis out of the tweet, it sends.
Also my phone won't let me update my apps. Only because for some reason, when it asks for my apple id and password, it already has my id entered in there, but only part of my email and leaves out the "@yahoo.com" part, which is the only way it will work.
Can someone please tell me how to fix both of these problems?

I think it's just the ios acting up, I've tried to use emoji s in my tweets and it just says error can't send. Try restoring?

Do not restore without doing a back up in itunes or you will lose all your data and pictures and settings… Etc… First try holding sleep/wake button down and home button in at same time till apple logo appears… Then let go of buttons… This will reset the phone. It will shut off then turn back on. Check to see if the problem is corrected. You should always have a back up on your computer of your phone… Just a good habit in case something happens.

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