What's the best sim card for using iPhone 5S around Europe?

So I'm going to Europe in a couple of weeks and was wondering what my best option if for using my phone. I'm travelling through Italy, Austria, Czech Republic & France. Additionally, would I require a new sim card in those countries to avoid roaming charges or aren't then any in Europe for european sims?

Also, it's an iPhone 5S so I need a micro sim… Will that pose an issue? Can you buy sim cards at the airport in Rome?

IPhone 5s jailbreak warranty?

Hi so I want to jailbreak my iPhone but I read online that if I do it'll void my warranty but if I jailbreak it and then something happens (breaks etc) and I do a full restore will the warranty become unvoided?

Which is the Best Software Company in Pakistan?

I'm looking for a company who can make projects of Website and Android and iPhone Applications, based on Java, PHP, .NET and different other languages and platforms, in reasonable cost and reliable most.

Iphone 4S keeps locking and saying slide to power off?

And the lock button won't even work. Everytime it turn it off, it keeps turning back on by itself. It started being like this when some water spilled on it. I just wiped off the screen but i didn't realize that there was also some water at the back because i had my iphone case on so i just saw it probably 15 minutes later. Do you think it was because of the water? Sometimes it even takes screenshots of my lockscreen without me doing anything.
is there any way to fix it?

Added (1). now i did a soft reset where i held the home and sleep/wake button together (but i just used the assistive touch for the sleep/wake button on top because again, it isn't working) and now the apple logo keeps appearing and disappearing and can't turn it on at all.

Added (2). i just charged it and it turned on again but i'm 100% sure it will still be faulty in a few minutes

Is it ok to use Wi-Fi in a plane with Airplane Mode?

I have a question i'm going on a plane soon and i have a iPhone and i wanna use Wi-Fi on the plane the aircraft model is a Boeing 747 and i have heard bad stories that mobile phones can interfere with the planes system and cause it to crash!

Can I move out with 500 dollars?

Ok so I'm 18 and me and my friends are moving to Florida. I'm going to work full time there for a year to save up and apply for residency so I can get in state tuition so that's why I'm not going to college for a year. I finished my first year of college already and I plan on moving towards the end of august. Me and my friend are getting a place that's 150 a week of 620 a month, including water and sewage. I have an iPhone that I'm probably going to be paying for too which is about 70 a month, and were going to have 1 car (Toyota corolla) which is my friends and were splitting the gas costs. I really can't live with my parents anymore and they're driving me crazy and the apartment were getting requires first month a security deposit of 250, so with that said, how much can I afford for rent? And will I be able to move with 500? Or should I have 1,000? I'm moving in august no matter what by the way I can't live with my parents anymore I'm just tired of my life here. My friend is also going to be working part time and going to culinary school.