Can I swap a micro sim card on contract for a nano sim card?

I recently took out a 2 year contract with o2 about 6 months ago for a Nokia Lumia 820. I have had nothing but trouble with the phone, and have already spent money repairing it, and it has unfortunately broken again, and for the money it will cost to repair and no doubt for future repairs, I'm going to buy an iPhone 5. My Nokia Lumia 820 uses a micro SIM, and iPhone 5 uses a nano SIM, so I was wondering, if I get in contact with o2 and inform them of my dilemma, will they swap my micro SIM for a nano SIM, but with the same number/contract details etc so I can continue my contract with an iPhone, and if so how much will this cost and how should I go about it?

Weak signal with EE can I cancel upgrade within 7 days?

My old phone was broken so now I've done an early upgrade through Phones4U to an IPhone 5 on saturday, with a 24 month contract. Now I have realised that the signal is very weak (1 bar, 2 at most), and I'm seriously considering returning the phone, as the contract is very expensive. Would this be because of the phone or the carrier? And I was wondering if I could cancel the contract as it has only been 3 days? Does anyone know what Phones4U's policy is for returning upgrades? I would be extremely grateful if anyone can answer these questions as soon as possible, because if I can return it, I would need to do so VERY soon.

How much does a used iPhone 4s cost?

I wana buy a used 16 gb iPhone 4s it's in good condition but the home button is a little sticky how much do you guys think I should pay for it?

How long do I keep my iPhone 5 in rice for?

Long story short, my iPhone 5 fell into my washing machine and was probably there for about 6 minutes or so. The battery was already dead when it fell in… I still have my warranty with apple. How long should I keep it in the rice? Or am I out of luck…

Is this possible with and iPhone 5?

Is it possible to not be able to receive texts from one person, after having a conversation with them for 4 months on your phone? I tested my texting with 2 other people and they both replied, I don't know it their not getting my messages or not. My phone stopped receiving messages a few hours ago but I fixed that, obviously.

My iPhone 5 isn't receiving text messages?

I have an iPhone 5, it's about 4 and a half months old. It worked fine until a few hours ago. I have to do an entire system reboot (home and sleep button at the same time) if I wanna even check to see if I got a message every single time I wanna check. I'm having a very important conversation.

Will replacing my existing laptop hard drive affect my iTunes/iPhone?

I'm pretty sure I already know the answer but with me possibly losing my data from the main 2 devices I use in life I want to be sure.

I've made a system image using windows 7's built-in backup software and will be replacing my faulty hard drive with a larger capacity new one. Seeing as it's a full system image it should save all the iTunes program data, settings, media (songs/videos) and iPhone backup shouldn't it?

How to call private on iPhone?

I try to call Unkown, but when I call with *67 it doesn't come out Unkown on my iPhone 5 I know this because I tried it on my brother and it didn't come out private. How do I make it come out Unkown or blocked etc.without going to settings<phone<show my caller id