How to Choose a Business Phone System for Your Startup

Compare OpenPhone, Grasshopper, Google Voice, RingCentral, and Twilio to find the right business phone solution. Covers shared numbers, SMS capabilities, call routing, and scaling from founder to full support team.

Key Decision Criteria

Shared Numbers and Team Collaboration

High Priority

OpenPhone lets multiple team members share one phone number with a shared inbox—ideal for support or sales lines. Grasshopper routes calls but doesn't offer true shared inboxes. Google Voice is single-user. If multiple people answer one number, this is the deciding factor.

SMS and Messaging Capabilities

High Priority

Modern business communication increasingly happens over text. OpenPhone supports SMS, MMS, and scheduled messages. Google Voice has basic SMS. Grasshopper added texting but it's limited. Twilio gives you programmable SMS at scale but requires development work.

Call Routing and Auto-Attendant

Medium Priority

If customers call and need to reach different departments, you need an auto-attendant (press 1 for sales, 2 for support). RingCentral and Grasshopper have robust IVR systems. OpenPhone keeps it simpler with direct routing. Google Voice has basic call forwarding only.

Pricing Structure

Medium Priority

Google Voice starts at $10/user/mo (requires Google Workspace). OpenPhone is $15/user/mo with generous features. Grasshopper charges $14-80/mo flat regardless of users. RingCentral starts at $20/user/mo. Twilio is pure usage-based at ~$0.015/min plus a $1-2/mo number fee.

Questions to Ask Yourself

Do you need a simple second line or a full phone system?

Just need a business number that rings your cell: Google Voice or Grasshopper. Need shared team inboxes, CRM integration, and call recording: OpenPhone. Need enterprise PBX with video conferencing and fax: RingCentral. Building phone features into your product: Twilio.

Will customers primarily call or text you?

Call-heavy (support lines, sales): RingCentral or Grasshopper with robust call handling. Text-heavy (appointment confirmations, quick questions): OpenPhone's shared SMS inbox or Twilio for automated messaging. Mixed: OpenPhone balances both well.

Do you need to build custom phone features programmatically?

Twilio is an API platform, not a ready-made phone system. It's powerful for building IVR flows, automated reminders, two-factor auth via SMS, or embedded calling in your app. But it requires developer time. Everyone else offers ready-to-use solutions.

Red Flags to Watch For

No number porting support

If you already have a business number, you need to port it to your new provider. All reputable providers support porting, but some charge fees or have slow timelines. Confirm porting is free and takes under 2 weeks before switching.

Per-minute charges on domestic calls

Most modern business phone plans include unlimited US and Canada calling. If a provider charges per-minute on domestic calls (common with Twilio and some legacy providers), costs become unpredictable. Per-minute only makes sense for very low call volumes or API-driven use cases.

No mobile app or poor mobile experience

Startup founders take business calls everywhere. If the mobile app is buggy, drains battery, or has poor call quality, you'll miss important calls. Check recent app store reviews specifically for call quality complaints before committing.