Voice-controlled services employ voice-recognition technology to allow the wireless user to control features and services using spoken commands, names, and numbers. There are two main types of automatic speech recognition (ASR). Speaker-dependent requires specific spoken phrases unique to an individual user. Each user is required to train the ASR system by recording samples of each specific phrase. The other is speaker-independent ASR, which requires the use of specific spoken phrases that are independent of the speaker. The individual user need not train the system.

Voice-Controlled Dialing (VCD)
VCD allows a subscriber to originate calls by dialing digits using spoken commands instead of the keypad. VCD may be used during call origination or during the call itself.

Voice-Controlled Feature Control (VCFC)
VCFC permits a calling party to call a special VCFC directory number, identify the calling party as an authorized subscriber with a mobile directory number and personal identification number (PIN), and specify feature operations via one or more feature-control strings. This service is similar to remote feature control (RFC) except that the subscriber is allowed to dial feature-control digits or commands using spoken words and phrases instead of keypad digits.

Voice-Based User Identification (VUI)
VUI permits a subscriber to place restrictions on access to services by using VUI to validate the identity of the speaker. VUI employs a form of ASR technology to validate the identity of the speaker rather than determine what was said by the speaker. VUI requires that the subscriber register the service by training the ASR system by recording a word or phrase. When a user attempts to access a service, the ASR system prompts the user to say the special phrase.

Incoming calls to a subscriber may be given one of the following termination treatments: the call is terminated normally to the subscriber with normal or distinctive alerting; it is forwarded to voice mail or to another number; it is routed to a subscriber-specific announcement; or it is blocked. These kinds of services help subscribers control incoming calls and their monthly airtime bills. From a marketing standpoint, they entice cost-conscious customers who might not want unlimited access from callers.

Calling Name Presentation (CNAP)
CNAP provides the name identification of the calling party (e.g., personal name, company name, restricted, not available) to the called subscriber. The calling name information (CNA) is derived from the calling number information (CNI), which is generally provided to the terminating network as part of the basic call setup. Optionally, the date and time of the call may be provided to the called subscriber.

Password Call Acceptance (PCA)
PCA is a call-screening feature that allows a subscriber to limit incoming calls to only those calling parties who are able to provide a valid password (a series of digits). Calls from parties who cannot provide a valid password will be given call refusal while PCA is active.

Selective Call Acceptance (SCA)
SCA is a call-screening service that allows a subscriber to receive incoming calls only from parties whose calling party numbers (CPNs) are in an SCA screening list. Calls without a CPN will be given call-refusal treatment while SCA is active.

Short Message Service (SMS)
SMS provides the ability to deliver short messages as a packet of data between two service users, known as short message entities (SMEs). SMS incorporated into PCS networks allows for simultaneous paging and voice. Among its applications are paging via wireless phone screens and voice-mail notification.

Speech-to-Text Conversion (STC)
STC permits a calling party to create a short alphanumeric message by speaking to an ASR device that will perform speech-to-text conversion. The short message may then be distributed by any means available such as short message delivery.

Prepaid cellular can take a number of forms. One might be a debit card; one might be a connection to a smart card. These services allow customers to pay before they call and not be billed later. As the subscriber has already paid for the service, the carrier is not burdened with the risk or overhead of payment collection.