Why did my SMS throughput suddenly drop without warning?

Sudden throughput drops are typically caused by: carrier-detected content policy violations triggering automated throttling, a trust score re-evaluation downgrade after a complaint spike, campaign volume anomalies flagged as potential snowshoeing behavior, or an expired carrier addenda requiring renewal. MyTCRPlus provides diagnostic tools to identify the specific carrier-side cause of throughput drops.

What is carrier-enforced SMS throttling and how does it affect message delivery?

Carrier throttling limits your messages per minute below your registered campaign throughput limit. T-Mobile, AT&T, and Verizon apply dynamic throttling based on complaint rates, content analysis, and volume anomalies. Throttled messages are queued or silently dropped — recipients never receive them. Throttling can affect delivery for hours to weeks depending on severity and whether the underlying trigger is resolved.

How do I diagnose the cause of a sudden 10DLC throughput drop?

Start by checking your TCR portal for trust score changes, campaign status updates, or new rejection codes. Review your message logs for content changes, volume spikes, or new URL domains introduced near the throughput drop date. Check carrier-specific reporting available through your messaging platform. MyTCRPlus's throughput drop diagnostic tool cross-references these signals to identify the root cause.

Can SMS throughput be restored after a carrier-imposed reduction?

Yes. Throughput restoration depends on the cause. Content violations require correcting prohibited message elements and allowing 24–72 hours for carrier filter recalibration. Trust score drops require remediation actions (DUNS verification, complaint reduction) and a re-evaluation cycle of 2–6 weeks. Volume anomaly flags typically resolve within 48–72 hours after returning to normal sending patterns.

Does a throughput drop affect all my registered campaigns or just specific ones?

Throttling can be applied at the campaign level (affecting only the specific campaign flagged) or the brand level (affecting all campaigns associated with the brand). Campaign-level throttling is the more common response to content violations. Brand-level throttling follows serious compliance failures such as SHAFT content detection or fraudulent registration information. Monitoring each campaign's throughput independently is essential for early detection.

Fix Sudden SMS Throughput Drops | MyTCRPlus

DIAGNOSTIC GUIDE

Fix Sudden SMS Throughput Drops

Messages delayed or blocked? Identify why your 10DLC speeds were throttled—from Trust Score changes to daily caps—and restore your full capacity.

Check My Throughput Diagnose Cause

Carrier Insights Score Analysis Fast Restoration

Understanding Throughput Throttling

Throughput drops manifest as message queues backing up, "Carrier Violation" errors, or messages taking hours to deliver. This is rarely a technical glitch; it is almost always an enforcement action by carriers based on your sending behavior or brand score.

Business Impact Delayed Notifications

Escalation Risk Total Campaign Suspension

Urgency High - Requires Audit

Common Root Causes

Trust Score Decay

A drop in your Trust Score (e.g., from Low to Very Low) automatically reduces your daily message cap.

Active Filtering

Carriers detected spam-like content (e.g., shortened URLs, aggressive keywords) and are throttling delivery.

T-Mobile Daily Cap

You exceeded the T-Mobile daily limit for your brand tier (e.g., 2,000/day for Low Trust).

How to Restore Speed

Follow this protocol to identify the bottleneck and restore your throughput capacity.

1

Check Trust Score

Log into your CSP or TCR portal. Did your score drop? If it's below 50, your limits have been severely cut.
2

Audit Content

Run your recent messages through our validator. Remove public shorteners (bit.ly) and ALL-CAPS words that trigger filters.
3

Request Re-Vetting

If your score is low, pay for Secondary Vetting ($40) to potentially boost your score and unlock higher tiers.

Throughput Tiers

Your daily capacity is directly tied to your Trust Score. Here are the standard T-Mobile tiers:

Trust Score	Daily Message Cap	Throughput (TPM)
Low (0-24)	2,000 / day	15 TPM
Medium (25-49)	10,000 / day	60 TPM
High (50-74)	40,000 / day	240 TPM
Top (75-100)	200,000 / day	3,600+ TPM

Prevention Strategy

Maintain high throughput by proactively managing your reputation.

Monitor Opt-Outs

Keep opt-out rates below 3%. High opt-outs signal spam to carriers.

Branded Links

Always use branded domains for links. Never use generic shorteners.

Consistent Volume

Avoid massive spikes. Ramp up volume gradually to "warm up" numbers.

Restore Your Speed

Don't let throttling kill your campaign ROI. Use our diagnostic suite to identify the bottleneck and fix it fast.

Diagnose Now

Frequently Asked Questions

Does unused daily capacity roll over?

No. Daily caps reset every 24 hours (usually midnight PST). Unused capacity is lost.

Can I appeal a low Trust Score?

Yes, through "Secondary Vetting." This involves a manual review of your business for a fee (approx. $40) and can significantly raise your score.

Does AT&T have daily limits?

AT&T limits are based on TPM (Transactions Per Minute), not a daily cap. However, exceeding TPM triggers blocking, which feels like a throughput drop.

Message Validator

Check for content that triggers filters.

Validate Now

Trust Score Sim

Predict your throughput tier.

Run Sim

Remediation Tool

Fix active blocks and rejections.

Use Tool

Legal Disclaimer: This content provides general troubleshooting guidance for SMS throughput issues and does not constitute legal advice. Throughput limits are determined by mobile carriers and The Campaign Registry based on Brand Trust Scores and vetting status. MyTCRPlus does not guarantee specific throughput rates.