Phone2 vs Sideline
Sideline is a personal second line app using carrier calling, not a business phone system. Phone2 gives you team collaboration, AI features, and integrations that Sideline simply doesn't offer.
30-day money-back guarantee. Plans start at $7/month.
Compare features side by side
See how Phone2 stacks up against Sideline
Why teams move from Sideline to Phone2
Real reasons businesses are making the switch
Get a real business phone system
Sideline is a personal second line. Phone2 is a complete business phone with shared numbers, team inbox, and professional features.
AI-powered features
Phone2 transcribes your calls and generates AI summaries. Sideline has no AI features whatsoever.
Toll-free numbers available
Need an 800 number? Sideline doesn't offer them. Phone2 does, on every plan.
Connect to your tools
Phone2 integrates with Slack, Zapier, and CRMs. Sideline works in complete isolation.
Sideline: The Good and The Bad
An honest look at what Sideline does well and where it falls short
What Sideline does well
Very affordable
Just $9.99/month or $7.99/month billed yearly
Carrier-quality calls
Uses your carrier network (not VoIP) for reliable call quality without WiFi
Simple app
Easy to use with minimal learning curve
Auto-reply
Automatic text replies for missed calls
Spam detection
Filters out telemarketers and potential fraud calls
Where Sideline falls short
No team features
Designed for individuals only, no shared numbers or collaboration
Enterprise plan discontinued
Auto-attendant and advanced features removed in June 2025
No call recording
No way to record calls on any plan
No integrations
Doesn't connect to any business tools
No AI features
No call transcription, summaries, or automation
No toll-free numbers
Only local numbers available
Mobile-only
No desktop app - can only use on your phone
The Verdict
Which one is right for your team?
Choose Phone2 if...
- You need a real business phone system
- Your team needs to share numbers and collaborate
- You want toll-free or vanity numbers
- AI transcription and summaries matter to you
- You need integrations with other business tools
Choose Sideline if...
- You just want a cheap second personal line
- You're a solo user with zero business needs
- You only need the most basic calling features
Our Take
Sideline is a budget personal second line, not a business phone system. If you're running any kind of business or have a team, Phone2 gives you infinitely more value with shared numbers, AI, and integrations.
Audrey Xi
Product Analyst
Audrey researches business communication tools and helps teams find the right phone system for their needs. She has reviewed over 50 VoIP and business phone solutions.
Last reviewed: January 8, 2026
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Phone2 vs Sideline: Common Questions
Phone2 is VoIP-based with desktop apps, team collaboration, AI features, and integrations. Sideline uses your carrier network (not VoIP) and is designed for individuals who want a simple second line.
Yes! Phone2 charges a $15 one-time port-in fee (waived on annual Pro). Note that Sideline charges $19.99 to port your number out.
No. Sideline is designed for individuals only. Their Enterprise plan with business features was discontinued in June 2025.
Yes. Phone2 starts at $7/user/month with more features. Sideline is $9.99/month ($7.99 annual) with very basic functionality.
No. Sideline uses your carrier network, which means calls work without WiFi but you need cellular coverage. Phone2 is VoIP-based and works anywhere with internet.
Sources & References
Ready to switch from Sideline?
Port your existing number to Phone2. Keep your number, lose the limitations.