Your numbers, calls, and
messages in one app.
Get a private second phone number for texts and calls, and use it anywhere with Wi-Fi or mobile data. Every conversation in one inbox.
Everything a second line needs, without the contract
Decibell turns one app into your second phone line. Pick a number from the ones available in the app and use it for texts, calls, photos and threaded conversations.
SMS Messaging
Send and receive text messages with delivery and read receipts.
Voice Calls
Crystal-clear VoIP calls with native CallKit on iOS. Incoming calls ring like a regular phone.
Multiple Numbers
Own as many numbers as you need and keep family, travel, and online sign-ups separate in one inbox.
Use It Anywhere
Your number works over Wi-Fi or mobile data, so it stays with you when you travel or move.
Threaded Inbox
Every number and every contact, organized into clean conversations with pin, archive, and unread badges.
Contacts
Save your own contacts inside the app.
Built like a telecom carrier, priced like an app
Real-time delivery status, push notifications when you're offline, and a clean conversation UI you'll actually want to use.
Buy Numbers Instantly
Browse the numbers available in the app, pick one you like, and start using it in seconds.
SMS in & out
Send a text from any of your numbers. Replies show up as a threaded conversation with delivery, sent, and read states.
VoIP Voice Calls
Initiate or receive voice calls over IP using native provider SDKs with low-latency audio.
MMS & Media
Receive images, GIFs, and other media inline in a conversation. Tap to view full-screen or share.
Conversation Inbox
Every number you own gets its own thread per contact. Pin the important ones, archive the noise.
Number Choice
See which numbers are available right now and choose the one that fits you.
Multi-Provider Routing
Decibell delivers your texts and calls through licensed telecom providers and switches automatically if one has a problem.
Real-Time Delivery Status
See pending → sent → delivered → failed for every outbound message, in real time, with reasons when something fails.
Push Notifications
Stay reachable even when the app is closed. New messages and missed calls arrive as native push notifications.
Native iOS CallKit
Incoming calls ring with the system UI. Accept, decline, mute, or send to voicemail like any other call.
Personal Address Book
Save the people you actually talk to. Names, numbers and emails are all kept inside the app for quick access.
Block Unwanted Numbers
Block any number from reaching any of your phone numbers. Spam stops where you set the line.
VoIP Push Reliability
Calls use APNs VoIP push (PushKit) so the system wakes Decibell instantly. No missed rings.
Call History
Browse every inbound and outbound call with duration, status, and contact, and tap to call back.
Pin & Archive
Promote important threads to the top and hide finished ones, so your inbox stays clean as you grow.
Encrypted in Transit
Every message and signaling event between you, Decibell, and the carrier travels over TLS. We don't read your messages.
Synced Across Devices
Sign in on a new device and your numbers, conversations, and contacts come with you instantly.
From install to first message in 60 seconds
No SIM, no contract, no porting. Open the app, pick a number, and you're online.
Create your account
Sign up in the app with email or phone. Decibell creates your inbox and grants the permissions you choose to allow.
Pick a number
Browse what's available right now, pick a number, and you're ready to text and call.
Send, call, repeat
Start a conversation, place a voice call, share media. Everything lands in your unified inbox with real-time delivery.
Ready to consolidate every number you carry?
Stop juggling SIMs and extra phones. Decibell gives you one inbox for texts and calls. See plans in the app.