My Contract iPhone 5s did not come with a sim card? What should i do?

I got my iphone 5s today on contract with ee, but it did not come with a sim card. What should i do? If i go and get a sim card from a shop will i still have the same contract as the one i ordered?

There are a few things you can do, that I know of.
1. You can go to the store where you have your data plan (you said ee?) and get a sim card for your iPhone or go to the apple store (i think) and get a sim card for your iPhone.
2. You can go to the store where you have your data plan (ee?) and pretend to be interested in a flip phone that carries the same type of sim card as your iPhone. You can purchase the whole plan for your phone as though it were for the cheap flip phone, and then go home and remove the sim card and put it into your iphone instead. It should work the same.
Solution 2 works for iPhone 3 and iPhone 4 and PROBABLY iPhone 5 but I've never personally tried it with a 5s…
There's a large variety of tech communities on the internet that can help you with the whole process, but unless you Really wanna save a buck I suggest just buying an iPhone sim card.

Your contacts will be the same in any new iphone you get if you've synced them with iCloud or another computer, and then restored them to your new phone. If you haven't done that already you should either connect your old iphone to a computer and back it up, or go to settings>icloud>contacts>on on your old iPhone, which will synch your contacts with the cloud, therefore making them available on your new iPhone when you enter your apple ID into your new iPhone.