If I update my unlocked iphone will it lock up again?

I bought an unlocked phone off of a guy who doesn't know the original carrier, it is unlocked to fido. I don't know much about the unlocking system but he told me if I update it on itunes that it will be locked back up. I have a fido sim card in it and hes not sure if its a rogers or fido phone. So apparently if i update it and its a rogers phone it will lock up then I will have to pay money to get it unlocked again.

Does Apple have a warranty on water damaged products?

Today, my iPhone 4 fell into the sink and automatically stopped working. However, I don't have insurance on it with my phone carrier. Apple has a 1 year warranty on all its products, but i don't know if they accept water damaged products. If i bring it to the store, will they exchange it for a new one?

Added (1). I've only had my iPhone for 28 days.

How to upgrade to a Verizon iphone and sell it on ebay?

I've searched for this question but all the answers (I could find) were from 2011 or earlier, so I want to make sure nothing has changed.

I like my current phone, but I'm eligible for a free upgrade to a iphone 4 with Verizon. I'm going to be with Verizon for the next 2 years anyway so I'd like to get the iphone to sell on ebay. I'm pretty sure I will need to activate it and use it for a period of time… Anybody know how long? And does anybody have a link that explains how I clear the data/unlock it/whatever else I need to do before I sell it?

Thanks!
Amy

Added (1). Yoda - I don't want to keep the new phone. I like my phone that I'm using now, and plan to use it for the next 2 years. So I want to upgrade, but then sell the NEW iphone on ebay to make some money. Sorry I didn't say that better originally… Thanks!
Amy

I think people are trying to jump me at school? What should I do?

For a couple of weeks I've been working really hard and saving all the money I could get to buy an iPhone 4… Well, lately in my Physical Education class, these three black guys have been asking me about my phone (What plan are you on, where'd you get it, how many gb, what's your number, let me see it, unlock it for me and show me your password, etc.) and I havn't really thought nothing of it, until today one of them pulled me away while I was dressing out. I had my iPhone sitting on the bench and one of them put his arm around me being friendly, telling me that he needed to ask me an important question, and he tried to lead me to the bathroom, but I told him to hold on a sec and I grabbed my phone. He asked me if I wanted to buy some weed and I told him no, then I walked away. Then later on my friend came up to me and told me they've been watching me and he thinks they are trying to jump me and steal my phone, and that they would have taken it from me if he didn't follow behind us to the bathroom. I'm really worried now. What should I do besides call the police and tell the teachers? I don't want to be a snitch, and I have some friends that will back me up if they tried to jump me, but I really don't want to fight. What should I do?

What providers support a Verizon iPhone 4?

I'm leaving my parents plan and paying for my own phone, what other carriers besides Verizon supports a Verizon iPhone 4? I know companies like at&t make you buy a whole new phone to go with them.

Which iPhone carrier for uk?

I want the iPhone, I'm not really interested in other phones. I'm moving to either Brighton or Norwich. Please tell me which plan is the best with the best and fastest service.
O2- Unlimited Minutes, Texing with 1gb of internet for 41 pounds
T-Mobile Unlimited Minutes, Texting and internet for 41 pounds
Vodafone has unlimited talk and text with 1gb of data for 37 pounds
Orange has unlimited talk and text with 2gb of data for 41 pounds
They are all similar prices but which one has the best service in Norwich/Brighton.