SMS Campaign Queuing — Bypass Android Limits with Smart Scheduling
Send hundreds of SMS through your SIM card without hitting Android rate limits. Smart server-side queuing with configurable intervals.
Server-Side Queue That Respects Limits
Android blocks rapid SMS sending. SIMtrix queues messages server-side and sends them at safe intervals.
Smart Queue Engine
When you launch a campaign, all messages are queued on the SIMtrix server. Instead of sending them all at once (which Android would block), messages are dispatched one by one at configurable intervals — typically 35+ seconds between messages. This bypasses Android's built-in SMS rate limiting.
Configurable Send Intervals
Set the interval between messages: 35 seconds, 60 seconds, or any custom value. Shorter intervals = faster campaigns but higher carrier risk. Longer intervals = safer delivery. Find the sweet spot for your carrier.
Multi-Phone Distribution
Connect multiple Android phones and SIMtrix distributes campaign messages across them using round-robin scheduling. 3 phones at 35s intervals = effectively 12s per message. Scale your campaign throughput by adding phones.
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How It Works
From campaign creation to delivered messages — all queued and tracked.
Create Campaign in Bitrix24
Select your recipient list and message template in Bitrix24's marketing tools.
Messages Queued Server-Side
SIMtrix receives the batch and queues all messages with your configured interval and send window.
Dispatched to Phones
Messages are sent one at a time to connected Android phones, respecting rate limits and business hours.
Delivery Tracked
Each message's delivery status is tracked and synced back to Bitrix24 in real time.
Who Is This For?
Campaign queuing is essential for teams sending bulk SMS through SIM cards.
Marketing Teams
Send promotional campaigns to hundreds of contacts without hitting Android limits. Real-time progress tracking in the admin panel.
Sales Operations
Mass follow-up SMS after events or webinars. Queue them up, set the window, and let SIMtrix handle the rest.
Operations
Appointment reminders to hundreds of customers. Queued overnight, delivered during business hours.
Related Features
Explore more SIMtrix capabilities that work seamlessly together.
Frequently Asked Questions
Android has built-in rate limiting to prevent SMS spam. The limit varies by manufacturer and Android version but typically blocks rapid-fire sending after 30-100 messages. SIMtrix bypasses this by spacing messages at safe intervals.
We recommend 35 seconds minimum. This is safe for most carriers and Android devices. Some users go as low as 20 seconds, but this risks carrier throttling. For maximum safety, use 60 seconds.
There is no SIMtrix limit on queue size. The practical limit depends on your send interval and send window. At 35s intervals with an 8-hour window, one phone can send ~820 messages per day.
Send bulk SMS without hitting limits
Smart queuing. Safe intervals. Real delivery.
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