A whole business phone system.In a SIM card.
Every call passes through a real business phone system — greeting, menu, routing, recording, AI transcript — and only then rings the phone in your pocket. All of it lives on the SIM card itself. No app to open. No softphone in the path.
A real phone system. A real number.One SIM does both.
A carrier's second eSIM gives you a real cellular number — but no greeting, no phone menu, no voicemail to text, no routing. A business phone app gives you those features — but you live inside the app, and calls drop when Wi-Fi flickers. Kelir is one SIM with both: a real cellular line, with the full call-handling system already on it.
Every feature a business phone systemhas ever included.
The complete call-handling stack — auto-attendant, phone menus, voicemail to text, hunt groups, call recording, business texting, departments, working hours, web admin, CRM. Single-user features come with every plan. Multi-user features activate on Team. Plan availability marked on each tile.
Auto-attendant
Custom greeting, AI voice preview, time-of-day rules, holiday overrides.
Phone menus
Press 1 for sales, 2 for support — up to 4 levels deep on Pro. Routes by time, day, or selection.
Hunt groups
Ring the whole team at once, in sequence, or round-robin. Catch missed calls in a shared inbox.
Departments
Sales, Support, Finance — each with its own number, hours, voicemail, routing.
Call queuing
Position-in-line announcements, music on hold, max-wait fallback.
Working hours
Per-day schedules, custom out-of-hours greeting, per-user and company-wide.
Holiday overrides
Mark closures, route to a holiday voicemail, set it once for the year.
Voicemail per user
Audio + text transcript delivered by email. Searchable, forwardable.
Voicemail transcripts
Triage from the lock screen — read at a glance, no need to listen.
Call recording
On-demand or always-on. Encrypted at rest. Configurable retention on Pro.
Call forwarding
Conditional or unconditional. Route to a colleague, an answering service, anywhere.
Do-not-disturb
Manual, scheduled, or rule-based. Allow-list for VIPs that always get through.
Two-way SMS
On the business number. A2P 10DLC pre-registered for deliverability.
MMS · photos & docs
Send and receive media. Quote photos, contract PDFs, scans — through the cellular line.
CRM integrations
HubSpot, Salesforce, Pipedrive. Calls and SMS log automatically. Click-to-call.
Analytics dashboard
Volume, missed-call rate, peak hours, agent activity. By user and department.
Admin portal
User management, IVR builder, routing rules, recording downloads, billing — at app.kelir.io.
Encryption · E911 · audit
TLS 1.3 + AES-256, US data residency, E911 enabled, role-based access on Team.
This is the homepage scan — the full product showcase covers every feature in detail.
See the full product →What happenswhen a customer calls your business.
They dial your number. The greeting plays. The phone menu offers options. The right person's SIM rings — on the phone in their pocket. If nobody picks up, voicemail records, and the transcript lands in your email a few seconds later. Here's the path, step by step.
- 01PSTN
Caller dials your business number
Standard PSTN call lands on the Kelir-Telnyx interconnect.
- 02Kelir cloud
Routing platform takes over
Working hours, holiday rules, time-of-day branches evaluated.
- 03Kelir cloud
Auto-attendant or IVR
Greeting plays. Caller selects the right department or skill.
- 04Cellular eSIM
Native dialer rings on cellular
The selected user's eSIM rings via VoLTE. Lock-screen UI.
- 05Kelir cloud
Logged · recorded · transcribed
CDR, encrypted recording, transcript, CRM sync (Pro).
The greeting, the menu, and the voicemail all run in the background. Stage 04 — the ring — lands on the SIM in someone's phone. They pick up the same way they pick up any other call. No app to open.
See the full 8-step flow →What RingCentral, Dialpad, 8x8, Vonage, and Nextiva ship as software,Kelir ships as a SIM.
The same call-handling depth those vendors are known for — auto-attendant, phone menus, hunt groups, departments, recording, analytics, CRM. Delivered on the SIM card itself, not as an app or a desktop client. Side-by-side comparisons here.
- Kelir vs RingCentral
The same call-handling features. Without the desktop app or softphone.
- Kelir vs Dialpad
Greetings, menus, hunt groups — without the app that drops calls when Wi-Fi flickers.
- Kelir vs 8x8
The phone system 8x8 ships, without their softphone client running on every device.
- Kelir vs Vonage Business
Same business call handling. None of the desk-phone or softphone install.
- Kelir vs Nextiva
The features Nextiva sells, without the platform sprawl. Just on the SIM.
Each person on the team gets a SIM.The system runs across them.
Departments, phone menus, hunt groups, and a shared inbox running across everyone's SIMs. Sales calls reach sales. Support reaches support. Internal calls between teammates are free. Run routing from a web admin — no IT, no desk phones, no apps for anyone to install. From $29.99 per seat.
- Up to 50 users· Starter / Pro
- Hunt groups · IVR· 3 strategies
- Departments· Per-team numbers
Starter $29.99/seat · Pro $39.99/seat · Monthly or annual, USD
- MCAvailableMaya ChenAccount exec · Austin, TX
- JROn callJordan ReyesAccount exec · Brooklyn, NY
- PSAwayPriya SharmaAccount exec · San Diego, CA
- MWAvailableMarcus WebbAccount exec · Chicago, IL
Your number is yours. Port it outwhenever you want.
Bring an existing US number to Kelir, or take your Kelir number with you the day you decide to leave. The FCC requires carriers to release simple ports in one business day — Kelir doesn't lock you into a proprietary app, a contract, or a softphone graveyard.
Pick the plan. Get the SIM.Start sounding professional.
Solo if it's just you. Team Starter if you're a 2-to-50-person business. The same call-handling system on every plan. Annual billing is two months free. No setup fees. Cancel anytime.
For one-person businesses. A real business line on the phone you already have.
- Auto-attendant with custom greeting
- Business hours · in-hours and after-hours routing
- Voicemail to text, by email
- Call recording — on-demand or always-on
- Call forwarding and do-not-disturb
- Two-way business texting
- Rings on the dialer · CarPlay · lock-screen — no app for calls
- Bring your number, or pick a new one. Port out anytime.
For teams of 2 to 50. One SIM per person. Shared phone system across them all.
- Everything in Solo, per seat
- Hunt groups · sequential, simultaneous, round-robin
- Phone menus — two levels with custom greetings
- Departments — Sales, Support, Finance, etc.
- Call queuing with music on hold
- Shared inbox for the team's missed calls
- Web admin at app.kelir.io
- Free calls between teammates
United States · USD · Cancel any time
The features that make a business sound like a business — the greeting, the menu, the voicemail, the routing — used to live in a closet of equipment. Then they moved to desk phones. Then they moved into apps. Each move was supposed to make the system smaller and easier. Each move came with new things to install, maintain, and lose calls inside of. Kelir is the next step: dissolve the features onto the SIM card itself. The phone you already have becomes a business phone. There's nothing else to install.