Keep in mind that not all phones support the add-on services listed here. As a general rule, the more advanced--and often more expensive--a phone, the more add-on features it supports. Do your research and make sure you choose a phone that is capable of handling all the services you plan to use.Also note that the major carriers sometimes disable certain features on your phone, usually because they want to protect a competing proprietary service. It's often possible to re-enable these features via an unlocking service, but there's no guarantee that your carrier will support the unlocked features.
