Yes.
that depends on which memory you use, whether the phone memory or the sim card memory
Yes , its system update not memory card update
I have no clue
If you have saved a game on an SD card and then move the card to another phone, the progress should stay on there.
You can't save gamecube memory to the wii it must stay on a gamecube memory card.
The memory card slot is spring loaded, you just have to push the card until it clicks into place. Then to release, you push it again and the spring will make enough of the card protrude from the PSP so you can pull it out.
If your Wii Sports game has broken, simply get another. Your memory will stay because the information is not saved on the disc itself, but on the memory card on the Wii.
You can save your messages to the SIM card but once you click delete all messages they will go away...I'm pretty sure. I have not yet found a way to completely lock a message so that when you delete your messages, it will stay. If you're talking about saving something like a picture message, this is somewhat possible. When you've selected the picture, click options then use then save to internal or external memory(whichever you choose). Otherwise, I don't think you can completely lock a regular text message from deleting.
No. They will stay. The point of the restore is that you can reset and restore someone's phone from a backup that was just made and they will never know the difference.
Provided that all of your contact details are saved on your SIM card and provided that the new phone hasn't got a SIM lock, yes. That's fully possible then.
If you have deleted them they are no longer there and you will not be able to access them again. If you want to be real sure that no fragments of the deleted messages re-appear with some kind of Hacking tool you could try and fill the memory with useless messages and delete them again.
Of the advantages of having an international SIM card is that it will allow you to stay in touch with friends and family and business associates reguardless of where you go. And you will be able stay in touch with the same amount of money as you pay for local rates on your phone when you travel abroad.