Cell service companies have come a long way in the last few years. Competition amongst them has become more fierce and the cost of business has fallen, which has led to companies like Spring, AT&t, Verizon and T-Mobile to offer better service plans. Many are getting closer and closer to very cheap unlimited plans that you can get with Straight Talk or Net10. For the most part, you won't find a promotion code or coupon code to help you save on your service plan. But when you do sign up for new contracts, for those companies still using contracts, you get a great promotional price on a new phone.