My mom has an iPhone 4S, but keeps complaining about it being slow and buggy. I have had her reset it a few times and delete any apps she doesn't use. I'm not sure what else might be causing it to be slow and unresponsive at times... Anyone else come across this? I feel bad for her, she bought the newest model but my iPhone 4 runs like 10 times better than hers and I've had that since June.