Multi-line calling
Manage multiple business numbers from one app. Choose which line you call from and keep conversations organized by business, brand, or department.
Fissible Phone · Early access
A Business Line You Can Trust and Keep
Fissible Phone gives owners serious business numbers on iPhone, powered by their own Twilio account. Calls use a native iOS calling experience, every line gets configurable call defense, and the number stays yours from day one.
- Business numbers on your iPhone with native CallKit and PushKit calling
- Run every business you own from one app
- Per-line spam filtering, blocklists, robot checks, menus, and fallback rules
- Recents explain what happened to today’s calls
- Your Twilio account, your number, your call data
An iPhone business line you actually own — calls and texts on a number that’s yours to keep, in your account, not ours.
Missed calls should not be a mystery
A business phone app cannot quietly drop important calls and leave you guessing. Fissible Phone is built around native iPhone calling and transparent call outcomes, so you can see what happened to today’s calls: whether a caller rang through, failed a robot check, hit a menu, or went to voicemail.
Most small business phone setups still force you into one of two bad options: forward everything to your personal cell, or stitch together phone numbers, SIP trunks, forwarding rules, softphones, and dashboards.
- Native iPhone call presentation
- Per-line call defense rules
- Call outcome explanations in Recents
- Caller context from telecom metadata and your own history
- No people-search dossiers
- Clear boundaries around carrier and setup realities
The goal is not magic. It is a business line that behaves like a real iPhone call, protects your attention, and tells you what happened.
Founder note
Why I built Fissible Phone
The first post explains the problem behind the product: a business number should be useful on your iPhone without putting your phone system, call history, and exit plan inside someone else’s account.
A business phone layer built around ownership
Fissible Phone turns your Twilio number into a dedicated iOS calling experience: the control of a real phone system without renting your business identity from someone else’s app.
Caller screening
Unknown callers shouldn’t get instant access to your attention. Fissible Phone is designed around screening, context, and smarter call handling.
Voicemail that’s easier to review
Review voicemail with transcription, caller details, summaries, and urgency labels using your own AI key — never ours.
Built for multi-business use
Operate more than one business or brand from the same device while keeping calls and lines cleanly separated.
Built for bilingual businesses
Use optional English or Spanish (US) caller menus per line — designed for owners and teams whose customers speak both.
iPhone-first experience
Designed around iOS calling patterns — not a desktop PBX interface squeezed onto a phone.
Real app screens, built around owner workflows
The app keeps line ownership, call defense, voicemail triage, and multi-venture grouping visible instead of hiding telecom behavior behind a generic phone log.
Designed for the real call flow
From unknown caller to follow-up, Fissible Phone is built around the full lifecycle of today’s business calls.
-
1
A caller reaches your business line
Calls come into your dedicated business number, separate from your personal phone identity.
-
2
Screening gives you context
Unknown callers can be screened before they reach you directly, using the rules you set for that specific line.
-
3
You answer, decline, or route
Take the call in the app, send it to voicemail, run a menu, or use fallback rules based on your setup.
-
4
Voicemail becomes actionable
Missed calls and voicemail can be reviewed later with transcription, summaries, urgency, and caller context.
-
5
Follow-up stays connected to the business
Call back from the right business line instead of exposing your personal number.
The business line that defends itself
Small businesses are constant targets for spam, robocalls, fake leads, vendor noise, and outright scams. A business phone system should protect your attention, not just ring louder.
Fissible Phone gives each line its own defense stack: always-on spam filtering and blocklists, optional robot checks, optional bilingual menus, optional ask-who’s-calling prompts, and fallback rules for when a call needs to reach a cell phone.
- Screen unknown callers before they reach you directly
- Separate real customers from noise
- Use press-to-accept fallback to avoid carrier voicemail surprises
- See why a call was screened, routed, or sent to voicemail
- Build caller context from telecom metadata and your own history
Voicemail you can actually use
Traditional voicemail is a backlog. Fissible Phone is designed to make voicemail easier to triage without turning AI into a gimmick.
Instead of only a recording, voicemail can include transcription, caller details, summaries, urgency indicators, and structured notes. Summaries and urgency labels are optional and run on your own AI key — never ours.
- Voicemail inbox built for business follow-up
- Transcription for faster review
- Caller details where available
- Urgency and intent indicators
- Block or add callers from voicemail context
One app for every business you own
Many owners do not operate in a single neat box. An agency line, a vineyard line, a side project, a private consulting number, or separate numbers for different teams can all live in one iPhone app, with their own identity and screening rules.
- Group lines by business, brand, or venture
- Choose which line you call from
- Set different screening rules per line
- See which business a call belongs to before you answer
- Test a new venture without mixing it into your main business
- Keep business calls out of your personal phone identity
Coming next: an AI receptionist that forwards to your team
Planned · paid subscriptionMost small businesses do not need every employee carrying a business line. They need calls answered, screened, and handed to the right person. Fissible Phone is being built as the foundation for an AI receptionist subscription: one owner holds the account and the main business number, the AI answers and screens unknown callers, then warm-transfers the call or texts the details to the right employee’s own cell phone — no app, no seat, and no line for staff to manage.
- Screen calls when you are unavailable
- Ask callers for name, company, and reason for calling
- Book appointments or take a message, then hand it off
- Warm-transfer the call or text the details to the right employee’s cell
- No app, no seat, no line for employees to manage
- Route by business rules, in English or Spanish (US)
Your number, your account, forever
Most business-phone apps rent you a number inside their system. Fissible Phone works differently: your business line lives in your own Twilio account. If you ever leave Fissible, your number, call records, voicemails, and infrastructure are still yours.
Your exit plan exists from day one.
- Your Twilio account
- Your business numbers
- Your voicemails and recordings
- Your call records and line history
- Your AI key, if you use AI summaries
- Your path to leave without losing the line
Fissible Phone uses Twilio-powered communication infrastructure. It is not affiliated with, sponsored by, or endorsed by Twilio.
Twilio power without PBX complexity
Twilio is powerful infrastructure, but turning a Twilio number into a polished iPhone business phone usually means configuring credentials, softphones, forwarding rules, Studio flows, SIP trunks, or custom code. Fissible Phone turns that infrastructure into an iPhone-first business phone experience. Early access connects to your own Twilio account; guided setup and managed onboarding are planned, so owners do not have to become telecom admins.
- Built on proven communications infrastructure
- Designed for iPhone users, not telecom admins
- Avoids fragile DIY softphone setups
- Gives small businesses a more polished call workflow
- A path from simple line to receptionist automation
Setup docs for early access
Until the in-app provisioning wizard ships, the setup guide is the onboarding product. It walks through the Twilio account, business number, Functions service, TwiML App, app connection, Doctor checks, and first test calls.
Not just another softphone
| Typical softphone | Fissible Phone |
|---|---|
| Connects to a number | Runs on the business number in your Twilio account |
| Requires telecom setup | Uses guided setup docs today, with managed onboarding planned |
| Treats every call the same | Lets each line have its own screening and fallback rules |
| Generic call history | Recents explain current call outcomes instead of leaving you guessing |
| Usually one account, one line | Built for owners managing multiple businesses, brands, or ventures |
| Mostly reactive | Combines call defense, voicemail triage, and future receptionist automation |
Built first for multi-venture owners
Fissible Phone is for people running more than one thing: owners too serious for a personal cell number, but not interested in a heavyweight enterprise phone system.
Agencies
Consultants
Founder side projects
Local ventures
Solo founders
Small teams
Multi-brand operators
Twilio-backed numbers
Frequently asked questions
Is Fissible Phone available now?
Fissible Phone is currently in development. Early testing is underway, and the product is being prepared for broader availability.
Is this a replacement for my personal phone number?
No. Fissible Phone keeps your business number separate from your personal number while letting you manage business calls from your iPhone.
Does it support multiple business lines?
Yes. Multi-line and multi-business workflows are central to Fissible Phone: one owner can keep separate ventures, brands, or departments organized in one iPhone app.
Does it work with Twilio?
Yes. Fissible Phone is built around Twilio-backed calling infrastructure. Early access connects to your own Twilio account; guided setup and managed onboarding are planned, so you won’t have to assemble a softphone stack yourself.
Is Fissible Phone affiliated with Twilio?
No. Fissible Phone is built by Fissible and is not affiliated with, sponsored by, or endorsed by Twilio.
Is it available in Spanish?
Caller menus can be configured in English or Spanish (US). The app is designed for owners and teams whose customers speak both.
Will it support SMS?
SMS support is planned. The initial focus is business calling, caller screening, voicemail, and call workflow quality.
What is the AI receptionist?
The planned AI receptionist is a future paid subscription feature intended to screen calls, take messages, and warm-transfer or text the details to the right employee’s phone — without adding a line or a seat for staff. See pricing for planned tiers.
Can it help with spam and scam calls?
Caller screening is a central product goal. Fissible Phone is designed to give businesses more context and control before unknown callers interrupt the workday.
Do I need to understand SIP, PBX, or Twilio Studio?
Long term, no — hiding telecom complexity behind a clean iOS experience is the goal. During early access, connecting your Twilio account involves some guided setup, and managed onboarding is planned.
Is there an Android version?
Fissible Phone is iOS only today. Android interest is being measured for future planning.
Get early access to Fissible Phone
Fissible Phone is in active development. Join the early access list to follow progress, test the app, and help shape the business phone system we’re building for iPhone-first teams.
Built by Fissible for small businesses that need a smarter, cleaner way to handle calls. Fissible Phone is not affiliated with or endorsed by Twilio.