Upgrading to an iPhone 4, but want to keep the same number?

Yesterday i upgraded my phone to an iPhone 4. The guy from T-Mobile said that i could keep my old number from my old phone. (LG Optimus) The iPhone arrived today, without an Micro Sim card. The LG Optimus sim card is a normal sized sim card and will not fit. So i'm left with needing a micro sim card for an iPhone 4, but i want to keep my old number. What shall i do? I also need the sim card to activate the phone. Does the micro sim card come separate in delivery because it has personal details? Help would be appreciated. Thank you. (The iPhone was delivered from an out sourced company, not T-Mobile themselves)

Added (1). I upgraded early. I bought out the rest of the contract. But i can still use my Normal sized sim card in my LG.

Ok… So why the hell wouldn't you go to T-Mobile store and ask them to transfer your info to a new simcard that fits the iPhone? Also, T-Mobile sucks.

If you need to trim your SIM card to a micro-SIM size, here are your options:

1. Head to Amazon.com and search for a micro-SIM cutter, like this one. It works like a hole punch. When it arrives, you'll simply place your SIM card in the tray and punch out a smaller size. As a bonus, you'll also receive two adapters, which will allow you to put the micro-SIM card back into a regular-size SIM slot later on.

2. Do it yourself. If you need to trim your micro-SIM card immediately, print out this free template and follow the instructions on the page. It's crucial that you take your time with this project, because if you make a mistake, you'll have to purchase a new SIM card. For the best results, use a sharp pair of scissors and always cut less first and trim (or file) later, if need be.

3. Find out if your carrier's store will do it. When Always On host Molly Wood needed to fit her T-Mobile SIM card in the Samsung Galaxy S3's micro-SIM slot, she went to her carrier's store. They were able to trim it with a SIM cutter they had on hand. Call ahead and find out if your carrier's store has a micro-SIM cutter. Mfg p

If your new and old contract are both with t-mobile then you can keep your number no matter what. You are meant to get a new sim with your phone which comes in the box, the external companies simply place your new sim in the box.

You can cut your old sim down to size to get it to fit but it may leave it a bit uneven when fitting it in the card slot.

Best thing to do is to call up t-mobile and just tell them you upgraded the other day and now need a micro sim as you only have a regular and they will send you one out as soon as possible.