Your private inbox from trusted businesses
No more SMS from unknown numbers. Get alerts, receipts and codes — only from businesses you choose to connect with.
Why MySierraBox
You're in control. Always.
Only businesses you connect to can message you
No strangers in your inbox, ever.
Every sender is verified by MySierraBox
Banks, fintechs, and services — vetted before they reach you.
See your amounts and references at a glance
Bank alerts show exactly what happened — no guessing.
Change your phone, keep your connections
Your MSB Code moves everything to your new device instantly.
How it works
Three simple steps
Download & register
Install MySierraBox and create your anonymous profile in under a minute.
Connect with businesses you trust
Browse the directory, tap Connect, and the business opens a private channel just for you.
Receive messages you can trust
Alerts, codes, receipts — clear, structured, and only from who you said yes to.
For Businesses
Want your business on MySierraBox?
Replace unreliable SMS with a verified, trusted channel. Send alerts, OTPs, and notices to customers who actually want to hear from you.
Get in touch →