My first advice is to never rush, if you are patient you can wait for some special deals which will let you save much more money. That's why it's important not to choose the first carrier which you notice, you should analyze his offer and compare it to his competitors in order to make the best choice. You should compare the monthly price of your contract and what is crucial, you should learn what is included in it. How many minutes you can use for free. If you're considering carrier's change, it will be also smart to check if they can lower the price once you choose to use the phone carrier as you Internet provider. Some companies offer such packages for a lower price.
If it's not your first service provider and your considering switching carriers, I've got a good news for your - you can keep your old phone number even if you decide to switch from wireless carrier to a land line one. There are of course a few restrictions, but in most cases you will be able to do this without any troubles. It's all thanks to the LNP which stands for "local number portability". It guarantees you that if you decide to switch carriers, they can't deny your request. If they do, you can file a complaint to FCC.
Once you compare all the plans of different phone carriers, you should find some reviews of the company which you chose. It's very important, because even the best and the cheapest offer doesn't mean that the carrier is reliable. Learn more about its technical support as well as the quality of services to make sure that you will not regret your choice.