CTIA Consumer Code for Wireless Service [pdf] requires that cellular providers notify customers if they are exceeding their airtime limits. MTA notifies Mobile customers via text message, for the following scenarios:
• When you reach 90% and then 100% of your plan minutes.
• When you initiate a 411 call.
• When you initiate roaming while not subscribed to a roaming plan, or when you reach 90% and then 100% of your roaming minutes.
• When you initiate a long distance call while not subscribed to a long distance plan, or when you reach 90% and then 100% of your long distance minutes.
MTA usage alerts are usually sent on weekday mornings between 9 and 10 am. Alerts are sent at first occurrence for each limit on each bill cycle. Only one notification per bill cycle for a 411 call, an unsubscribed long distance call, and an unsubscribed roaming call. All phones that share minutes will receive usage alerts.
MTA is a member of CTIA — The Wireless Association, an international nonprofit membership organization that coordinates the industry’s voluntary efforts to provide consumers with a variety of choices and information regarding their wireless products and services.
MTA complies with the CTIA consumer code relating to unlocking devices. MTA does not request that any device be locked by the OEM. However, some devices may not be unlocked due to manufacturer or technical limitations. It should be noted that carriers typically use different frequencies and air interface technologies to provide wireless network access. Accordingly, a device that works on one carrier’s network may not be technologically compatible with another carrier’s network. “Unlocking” a device refers only to disabling software that would prevent a consumer from attempting to activate a device designed for one carrier’s network on another carrier’s network, even if that network is technologically compatible. In other words, “unlocking” a device will not necessarily make a device interoperable with other networks — a device designed for one network is not made technologically compatible with another network merely by “unlocking” it. Additionally, unlocking a device may enable some functionality of the device but not all (e.g., an unlocked device may support voice services but not data services when activated on a different network). Carriers reserve the right to decline an unlock request if they have a reasonable basis to believe the request is fraudulent or the device is stolen.
For more information about the CTIA and Consumer Code, visit http://www.ctia.org/policy-initiatives/voluntary-guidelines/consumer-code-for-wireless-service.