Ios5 screwing up text messages and data allowances

Question

Hi,
using ios5 on my old iphone 4, and when iCloud came out, I pressed "download all", set the phone down and went to sleep. Somehow in the middle of the night, the phone went off the wifi and on the data network and went on it's merry downloading way. there is not an infuriated enough smilie to show what my face looked like when I woke up the next morning to a ''hey. you are 358 MB over your monthly data allowance!'' on the 13th of the month when my phone plan starts on the 5th of the month...
a) is there any way for the stores/icloud make you confirm you wanna keep downloading if you somehow get off a wifi network, so that BS like this doesn't happen again? I know you can't download anything over 20mb over the data network, but as very few song if any are over 20mb, then apparently no alarm went off and it kept downloading thru the effing night. There has got to be a way for this not to happen without having to look at the phone while it's downloading anything from iCloud/stores?
and b) after that $hit happened, i turned off data so to limit the $$$ on my next bill, but now I`''learned'' on facebook that apparently, with ios5, text messages aren,t really text messages anymore, but are iMessages and go out/in the data plan? Is there any truth to that? If it is so, then what the effing **** again? and how do I turn it back to sms so that it's deducted out of the illimited text messages part of my plan and not out of my already-way-over-used data allowance?
FWIW, I've still been using text messages since the 13th and it's working fine, even tho I have the data turned off, but now I'm really freaked out about opening my next invoice
Help TIA

Answer 1

To make sure you only use wifi for data, you can turn off the 3G data like you did. I can't explain why it would switch to your 3G data from wifi during the night. It could have been due to the network or the phone. The new iMessage is only between ios5 devices, so sending a text to another ios5 device will use data, but to other phones it will just send a regular sms text. You can turn iMessage off in the settings to make sure no data is ever used when texting. This is what I did since I have unlimited texting, but limited data.