Home /pricing/number-calculator

How many phone numbers do I need for my SMS volume?

Divide your expected daily SMS volume by 1,000 to get the minimum number of phones you need for healthy A2P 10DLC sender reputation. The calculator below does the math and recommends an InsertLead tier. Sending 1,000+ messages per day per number reads as bulk traffic to the carriers, which raises your spam score even if every message is well-formed and consented.

On this page
  1. Interactive calculator
  2. Why 1,000/day per number is the rule
  3. Worked examples
  4. What counts as "send volume"

Interactive calculator

messages/day
2 rotating numbers
Recommended tier: Growth ($99/mo)

Why 1,000/day per number is the rule

Carriers (T-Mobile, AT&T, Verizon) run their own spam-detection layers on top of the standard A2P 10DLC framework. They score sender numbers on a few signals, and one of the strongest is daily send volume relative to the number's typical pattern.

A US local number on a healthy "Standard" trust tier can comfortably send up to ~3,000 messages per day before the carriers start flagging it. But 3,000/day is the ceiling, not the cruise speed. Steady-state traffic well under 1,500/day reads as healthy. Going above that consistently increases your spam score, which manifests as "Spam likely" labels on phones, dropped messages, and eventually outright delivery blocks.

The conservative rule we recommend: cap at ~1,000 SMS/day/number for steady reliability. If you need more total throughput, add more numbers and rotate. Number rotation flow.

Worked examples

  • 500 messages/day: 1 number is plenty. Starter tier works.
  • 1,500 messages/day: 2 numbers (rounding up). Growth tier.
  • 3,500 messages/day: 4 numbers. Scale tier.
  • 7,000 messages/day: 7 numbers (round up to 8). Empire tier.
  • 15,000+ messages/day: 15+ numbers. Monolith (custom).

What counts as "send volume"

Daily volume = the messages YOU initiate. Specifically:

  • Campaign first-touch sends to a fresh import: counts.
  • Follow-up campaign sends to existing leads: counts.
  • AI autoresponder replies in active conversations: doesn't count toward the per-number daily cap — conversational outbound is treated differently by carriers and our throttle.
  • Inbound replies from leads: doesn't count. Receiving doesn't burden sender reputation.

So if you run 2,000 first-touch sends per day and another 200 AI autoresponder replies on top, your "volume" for sizing purposes is 2,000.

Related pages

Ready to try it? Request beta access