Phone StackPhone Stack

Call Routing

How Should Calls Reach Your AI?

Pick how much you want the AI to handle. Start as a safety net for missed calls, scale to full 24/7 coverage. Change anytime with one tap. Your phone number stays the same.

Only When I Miss a Call

Your phone works exactly like today. When you're busy, on another line, or away from your desk, Phone Stack picks up instantly instead of sending the caller to voicemail. The caller gets a real conversation, not a recording. You get a full summary with the transcript, outcome, and any actions taken.

What you get:

  • Zero disruption to your current workflow
  • Callers never hit voicemail again
  • AI books appointments, answers FAQs, routes urgent calls
  • Full call recording, transcript, and AI summary
  • Scale up to full coverage anytime

Best for: Businesses that answer most calls but lose a few every day to busy lines, lunch breaks, or after-hours calls.

Technical Details

Method

Conditional call forwarding

Triggers

No answer, busy, unreachable

Forwarding Code

**61* [your Phone Stack number] *11*20#

How It Works

Your carrier forwards the call to Phone Stack only when your phone doesn't answer within 15-30 seconds, when the line is busy, or when your phone is off/out of service. You control the ring time.

Live in Under 2 Minutes

Phone Stack detects your carrier, generates the exact forwarding code, and opens your dialer with it pre-filled. No IT department required.

Step 1

Tell us your carrier

Enter your phone number. Phone Stack looks up your carrier automatically, so we generate the exact forwarding code for your provider. No guessing.

Step 2

Pick your routing mode

Choose missed calls only, after hours, or all calls. Start conservative and scale up whenever you're ready. You can change this anytime.

Step 3

One-tap activation

Tap the button and your dialer opens with the forwarding code pre-filled. Hit Call, wait for the confirmation beep, and you're live. Under 30 seconds.

On a computer? No problem.

Phone Stack generates a QR code you can scan with your phone. It opens your dialer with the forwarding code already typed. Just hit Call.

Works With Every Phone System

Cell phone, landline, VoIP, or business PBX. Phone Stack generates the exact forwarding code for your carrier. No manual lookup, no guessing.

Cell Phones

  • Verizon
  • AT&T
  • T-Mobile
  • US Cellular
  • Mint Mobile
  • Cricket
  • Google Fi
  • Visible

Canadian Carriers

  • Rogers / Fido / Chatr
  • Telus / Koodo / Public Mobile
  • Bell / Virgin Plus
  • Freedom Mobile
  • SaskTel

VoIP & Business

  • RingCentral
  • 8x8
  • Vonage
  • Dialpad
  • Grasshopper
  • Google Voice
  • Five9
  • Ooma

Landline

  • AT&T Landline
  • Verizon Landline
  • Spectrum
  • Cox
  • CenturyLink
  • Comcast/Xfinity

Don't see your carrier? Choose "Other" during setup and we'll walk you through it step by step.

Nothing Breaks. Everything's Reversible.

Phone Stack is a layer on top of your existing phone system. Your number stays the same, your phone still works, and you can turn it off in seconds.

Keep your number

Callers dial the same number they always have. Nothing changes on their end.

Your phone still rings

With "missed calls only," your phone works exactly like today. AI is just a backup.

Turn off anytime

Dial ##21# to stop forwarding. ##002# clears everything. Instant, no waiting.

Switch modes freely

Go from safety net to full coverage and back. Changes take effect immediately.

Turn off forwarding from any phone

These standard codes work on every carrier. No app needed, no account login. Just dial from the phone that has forwarding enabled.

##21#

Stop forwarding

##002#

Clear all rules

What Happens When Your AI Picks Up

Whether it's a missed call, an after-hours inquiry, or a routine question, here's what the caller experiences.

Instant answer

AI picks up in under 1 second. No hold music, no "press 1 for...", no waiting.

Natural greeting

"Hi, thanks for calling [Your Business]. How can I help you today?" Sounds human, responds in ~320ms.

Resolves the request

Answers questions from your knowledge base, books appointments on your calendar, sends confirmation texts and emails.

Routes when needed

Urgent or complex calls transfer to the right person with full context. The AI briefs them before the handoff.

Post-call actions

Recording saved, transcript generated, AI summary created, CRM updated, follow-up scheduled. All automatic.

Call Routing FAQ

Everything you need to know about forwarding calls to your AI.

Start Catching Every Call Today

Set up in under 2 minutes. Your phone keeps working exactly like today. AI just catches what you miss.

Start Free Trial

30 free minutes included. No credit card required.