The AI Receptionist Overage Trap: How $29/Month Becomes $100+
Budget AI receptionists advertise entry prices of $24.95 to $29 per month, but overage fees quietly inflate the real cost to $60, $90, or over $100 once a business exceeds the included minutes or calls. As of April 2026, Dialzara's $29/month plan includes just 60 minutes and charges $0.48/minute after that, meaning a business using 200 minutes pays $96.20/month. AIRA's $24.95/month Starter plan covers only 30 calls, forcing any business with moderate volume onto a $159.95/month Pro plan. Trillet's AI receptionist ($49/month, 150 minutes included, $0.20/minute overage) costs $59 at 200 minutes and $99 at 400 minutes, making it the most predictable option once you factor in real usage.
The pattern is consistent across the market: low sticker prices subsidized by high overage rates. The only way to compare AI receptionist pricing honestly is to calculate total cost at your actual call volume, not the number on the landing page.
The Bottom Line
A business using 200 minutes per month will pay between $59 (Trillet) and $96.20 (Dialzara), despite advertised prices clustering around $29 to $49
Per-call billing models (AIRA, Upfirst) make cost prediction nearly impossible because a 30-second call costs the same as a 10-minute booking call
The cheapest advertised plan is almost never the cheapest plan at real-world usage levels
Which Trillet product is right for you? If you are a small business that needs an AI receptionist for missed calls, Trillet's D2C plan starts at $49/month with 150 minutes and $0.20/minute overage. If you are an agency or reseller looking to offer AI receptionists to your own clients, Trillet's White-Label platform starts at $99/month with $0.12/minute usage costs.
Total Cost at Real Usage: The Numbers
Every AI receptionist provider structures pricing differently, which makes apples-to-apples comparison difficult by design. The table below normalizes cost to what you actually pay per month at four common usage levels. All pricing data is as of April 2026.
Provider | Base Price | Included | Overage Rate | Cost at 100 min | Cost at 200 min | Cost at 300 min | Cost at 400 min |
Dialzara | $29/mo | 60 min | $0.48/min | $48.20 | $96.20 | $144.20 | $192.20 |
AIRA | $24.95/mo | 30 calls | ~$0.83/call | ~$83* | ~$159.95** | ~$159.95** | ~$159.95** |
Phonely | $50/mo | 250 min | $0.25/min | $50 | $50 | $62.50 | $87.50 |
Trillet | $49/mo | 150 min | $0.20/min | $49 | $59 | $79 | $99 |
Rosie | $49/mo | 250 min | Plan upgrade | $49 | $49 | $149*** | $149*** |
* AIRA uses per-call billing, not per-minute. 100 minutes is roughly 50 to 70 calls depending on average call duration. At ~100 calls, the Starter plan's 30-call cap is exceeded, likely requiring the mid-tier plan at ~$60/month or Pro at $159.95/month.
** AIRA's Starter (30 calls) and mid-tier (~100 calls) plans cannot accommodate this volume. Pro plan at $159.95/month covers 300 calls.
*** Rosie's Professional plan includes 250 minutes. Exceeding it requires upgrading to the Scale plan at $149/month (1,000 minutes), since Rosie does not publish a per-minute overage rate.
Two things stand out. First, Dialzara's cost curve is the steepest in the market because $0.48/minute overage compounds fast. A business using 400 minutes pays $192.20, more than six times the advertised $29. Second, Rosie's pricing is deceptively binary: you stay under 250 minutes and pay $49, or you upgrade to $149 with no middle ground.
Trillet's cost curve is the flattest. The combination of 150 included minutes and $0.20/minute overage means the jump from base price to 400 minutes of usage is $50 in overage, not $163 (Dialzara) or a forced $100 plan upgrade (Rosie).
Per-Minute vs. Per-Call Billing: Why the Model Matters
Per-call billing, used by AIRA and Upfirst, charges the same rate whether a call lasts 20 seconds or 15 minutes. That pricing model creates three problems for small businesses.
Short calls burn the same budget as long ones. A spam call that slips through filtering, a wrong number, or a quick "what are your hours?" call costs the same as a detailed appointment booking. On AIRA's Starter plan (30 calls at $24.95/month), each call effectively costs $0.83 regardless of length.
Volume prediction is harder. Most businesses can estimate total call minutes from phone records, but predicting the number of discrete calls is less intuitive. A business might field 80 calls in a slow month and 150 in a busy one, making per-call budgeting unreliable.
Average call duration shifts the math. If your average call is 2 minutes, AIRA's per-call pricing works out to roughly $0.42/minute on the Starter plan. If your average call is 5 minutes, the effective per-minute rate drops to about $0.17. That kind of variance makes it difficult to project monthly costs accurately.
Per-minute billing (Dialzara, Phonely, Trillet) is more transparent because the cost scales linearly with actual usage. A 2-minute call costs twice as much as a 1-minute call. The AI Receptionist Pricing Models Explained guide covers these billing structures in more detail.
What to Look for in AI Receptionist Pricing
Comparing AI receptionists on sticker price alone misses most of the real cost. Four variables determine what you actually pay each month.
Included minutes (or calls) relative to your volume
A plan with 60 included minutes only works for businesses receiving fewer than 60 minutes of AI-handled calls per month. If your AI receptionist handles 15 calls a day averaging 2 minutes each, that is roughly 900 minutes per month. The "included" allocation on most budget plans covers less than a week of that volume.
Overage rate
This is the single most important number in any AI receptionist pricing page. Dialzara charges $0.48/minute, Phonely charges $0.25/minute, and Trillet charges $0.20/minute. At 250 minutes of overage, those rates produce monthly totals of $120, $62.50, and $50 respectively, a $70 spread on the same usage. The AI Phone Answering Service Cost Breakdown walks through overage math across more providers.
Forced plan upgrades
Some providers (Rosie, AIRA) do not offer per-minute or per-call overage. Instead, exceeding your allocation means upgrading to the next plan tier. Rosie jumps from $49/month (250 minutes) to $149/month (1,000 minutes) with nothing in between. If you use 300 minutes, you pay for 1,000. That is a $100/month premium for 50 extra minutes of usage beyond the base plan.
Feature gating behind higher tiers
Price is not the only thing that changes when you upgrade. Rosie locks appointment booking to plans above $49/month and CRM integration to $299/month. AIRA includes all features on every plan. Trillet includes calendar integration, SMS follow-up, and spam blocking on its $49/month plan with no feature gating.
When "Cheap" Becomes Expensive
The overage trap works because small businesses tend to sign up based on current call volume and then discover their AI receptionist handles more calls than expected. That is actually the point of the product: it catches missed calls you were not answering before. The calls that the AI now handles are calls that previously went to voicemail or were lost entirely.
A plumber who currently misses 10 calls a week might estimate 40 calls per month, averaging 3 minutes each, for 120 minutes. On Dialzara's $29/month plan (60 minutes included), that works out to $29 + (60 x $0.48) = $57.80. Not terrible. But when word of mouth picks up during summer, call volume doubles. At 240 minutes, the bill becomes $29 + (180 x $0.48) = $115.40.
On Trillet, the same plumber pays $49 at 120 minutes (within the 150-minute allocation) and $49 + (90 x $0.20) = $67 at 240 minutes. The gap between the two providers widens as volume increases, not narrows.
The providers with the cheapest advertised prices are often the most expensive at real-world usage precisely because their business model depends on overage revenue. Low base prices attract signups. High overage rates generate margin. The sticker price is not the price.
How to Calculate Your Real Monthly Cost
Estimating your actual AI receptionist cost requires three numbers: your monthly call volume, average call duration, and the provider's overage structure. Here is how to find those numbers if you do not already have them.
Check your phone's call log or carrier dashboard for the past 3 months. Count incoming calls only (not outgoing). Multiply by average call duration. Most small business calls average 2 to 4 minutes.
Then apply the formula: Base plan price + ((Total minutes used - Included minutes) x Overage rate) = Actual monthly cost.
For per-call providers like AIRA, the formula changes to: Base plan price + ((Total calls - Included calls) x Per-call overage rate). Since AIRA does not publish a clear per-call overage rate on all tiers, you may need to estimate which plan tier covers your volume and use that plan's price as your total cost.
If your projected usage consistently exceeds 300 minutes, compare the mid-tier plans directly rather than assuming the cheapest entry plan will save money. A $49 plan at 400 minutes of usage will always cost less than a $29 plan at the same volume when the overage differential is $0.28 per minute.
Frequently Asked Questions
Which AI receptionist has the lowest overage rate?
Trillet charges $0.20/minute in overage, the lowest published rate among major AI receptionist providers as of April 2026. Phonely charges $0.25/minute on its Starter plan, and Dialzara charges $0.48/minute. AIRA and Upfirst use per-call billing rather than per-minute, making direct rate comparison difficult.
Why do AI receptionist plans include so few minutes?
Low included-minute allocations keep the advertised price low, which drives signups. Dialzara's $29/month plan includes only 60 minutes because that price point attracts budget-conscious buyers. The overage rate ($0.48/minute) is where the provider generates most of its revenue from active users. This is a standard SaaS pricing tactic, not unique to voice AI.
Is per-call or per-minute billing better for small businesses?
Per-minute billing is more predictable for most small businesses because costs scale linearly with actual phone time. Per-call billing (AIRA, Upfirst) charges the same amount for a 30-second call and a 10-minute call, which makes budgeting harder. If your business receives many short calls (quick inquiries, hours checks), per-call billing penalizes you. If most calls are long and detailed, per-call can work in your favor, but most small businesses have a mix of both.
How many minutes does a typical small business use per month?
Small businesses that use an AI receptionist as backup for missed calls typically use 100 to 300 minutes per month, depending on industry and call volume. Service businesses like plumbers, HVAC, and electricians tend toward the higher end (200 to 400+ minutes) because their calls involve scheduling, job scoping, and emergency triage. Professional services like law firms and accountants often land at 100 to 200 minutes.
Does Trillet charge overage automatically or require a plan upgrade?
Trillet charges overage at $0.20/minute with no forced plan upgrade. If you use 200 minutes on the $49/month plan (150 minutes included), your bill is $59. There is no service interruption, no tier jump, and no surprise. You pay for what you use above the included allocation, at a flat and published rate.
