Google Voice is a popular VoIP service that provides businesses with telephone numbers, voicemail, call forwarding, text messages, and voice messaging. However, it has limitations such as displaying personal caller ID when using it from a personal phone, not supporting toll-free or vanity numbers, and lacking call analytics. Businesses should look for additional features in a VoIP provider, including good call quality and connectivity, mobility, scalability, usability, security, and reliability. Alternatives to Google Voice include Twilio Programmable Voice, RingCentral, Grasshopper, and OpenPhone, which offer customizable solutions with various features such as programmable SMS solutions, video conferencing, toll-free numbers, and call tracking. These alternatives provide affordable pricing options, flexibility in terms of scalability and usability, and reliable customer service, making them suitable for businesses looking to replace Google Voice or expand their communication capabilities.