The AI Receptionist Overage Trap: How $29/Month Becomes $100+

TL;DR

A $29 AI receptionist plan can pass $100 when your AI handles more calls than its allowance covers. On Dialzara's published Business Lite plan, $29 includes 60 minutes and additional minutes cost $0.48 each. At 240 minutes, staying on Lite would cost $115.40 ($29 + 180 × $0.48). But comparing the next tier matters too: its $99 Business Pro plan includes 220 minutes, so 240 minutes would cost $108 ($99 + 20 × $0.45). The lower of these is still above $100. You do not have to remain on the entry plan.

As of September 2026, Trillet AI Receptionist is $49/month for 150 inbound AI minutes and $0.20 per additional minute. Its 240-minute plan-and-usage subtotal is $67. Trillet has overage; it is not unlimited. Other providers can also be good value depending on call count, feature needs and whether you switch plans.

The Bottom Line

A low monthly base is not a total monthly cost. Calculate the bill at your expected handled usage and compare each eligible tier.
Per-minute, per-call and per-unique-customer plans need different inputs. Per-call billing can favor long calls; a unique-customer model can favor repeat callers.
Trillet publishes a clear $0.20/minute overage with no required tier jump, but it is not the sole provider at that rate: Echowin advertises $0.20/minute pay-as-you-go voice plus $10/month per phone number.
Check separately billed SMS, forwarding, number, transfer and feature charges, plus any contract terms.

See Trillet's current pricing or the AI Receptionist.

Total Cost at Real Usage: The Numbers

The table uses USD monthly list prices checked on 23 September 2026. It assumes calls average three minutes, rounded up, and that every call comes from a different person for Goodcall. Those are example assumptions, not typical-business statistics. Thus 100/200/300/400 minutes correspond to 34/67/100/134 calls. We choose the cheaper published plan-plus-overage path where the comparison is clear; taxes, add-ons and annual discounts are excluded.

Provider	What is metered	100 min	200 min	300 min	400 min
Dialzara	Voice minutes; Lite $29/60 min at $0.48 extra, Pro $99/220 at $0.45	$48.20	$96.20	$135 on Pro	$180 on Pro
AIRA	Calls; Starter $24.95/30, Premium $59.95/90	$30.95	$59.95	$69.95	$103.95
Upfirst	Calls; same published Starter/Premium allowances and rates	$30.95	$59.95	$69.95	$103.95
Goodcall	Unique interacting customers; Starter $79/100, then $0.50 each	$79	$79	$79	$96
Trillet	AI minutes; $49/150, then $0.20/min	$49	$59	$79	$99
Phonely	AI minutes; Free 100, Starter $50 with conflicting published allowance/overage	$0 on Free	$50 on Starter	Confirm checkout	Confirm checkout

How the less obvious rows work: At 300 minutes, the example has 100 calls. AIRA Premium covers 90 and charges 10 × $1 above that, so $69.95; at 400 minutes, 134 calls means 44 × $1 above Premium, so $103.95. AIRA's $159.95 Pro is not required at either volume. Upfirst's published prices yield the same figures. Goodcall's 134 hypothetical calls are all distinct, so 34 above its 100-unique-customer Starter allowance cost $17; if those 134 calls came from only 50 repeat customers, it would stay $79. At 300 minutes, Dialzara Pro costs $99 + 80 × $0.45 = $135, less than Lite's $144.20; at 400, Pro costs $180, less than Lite's $192.20 and Plus at $199.

Phonely's own pricing page disagrees with itself: its Starter plan card says 200 minutes, while a detail table says 250, and its billing views show different Starter overage figures. A precise 300- or 400-minute total would choose one conflicting version. Get the current checkout or a written quote instead. For a wider 100/200/500-minute view, use the true cost calculator.

Per-Minute vs. Per-Call Billing: Why the Model Matters

Short calls. On a per-call plan, each eligible handled call counts even if it lasts only 30 seconds. This can make many short conversations relatively expensive, subject to the provider's spam and call-counting rules. AIRA and Upfirst advertise spam filtering.

Long calls. The same per-call model can be attractive for longer conversations because duration does not raise the number of billable calls. It is incorrect to say per-call pricing always penalizes small businesses or that per-minute pricing is the only predictable model.

Repeat callers. Goodcall counts a unique customer by interacting phone number for the month, not by call or minute. A returning customer who calls repeatedly can be economical on that model. A month of many first-time callers uses more of its allowance.

Minute metering. Trillet, Dialzara and Phonely meter included and extra voice minutes, but do not share identical prices or feature gates. At a selected tier, compute base fee + minutes above inclusion × that tier's rate. See our pricing-model guide.

What to Look for in AI Receptionist Pricing

Included minutes (or calls) relative to your volume

Estimate calls reaching the AI, not all calls to the business. A backup receptionist taking only missed calls may handle far less than an all-call route. If 15 AI-handled calls per day each last two minutes for 22 business days, that is 660 minutes; for 30 days it is 900. Your actual call log is more useful than a generic industry average.

Overage rate and the next tier

An overage rate is important, but so is the next plan. Dialzara Lite adds $0.48 per minute, Pro $0.45; Trillet adds $0.20; AIRA and Upfirst charge by extra call. Echowin advertises $0.20/minute pay-as-you-go voice plus a per-number fee, so Trillet cannot claim the lowest published rate across all competitors. Compare the total bill at each viable plan, not just one overage figure. Our cost breakdown gives more examples.

Plan switching, not assumed forced upgrades

AIRA, Upfirst, Dialzara and Goodcall publish higher tiers, but their published overage rules do not by themselves establish a forced upgrade. At some volumes upgrading is cheaper; at others staying on a lower plan with overages is cheaper. Check the vendor's billing and switching rules before signup. Trillet D2C has one published $49 plan and charges $0.20/minute beyond 150 without a required tier jump.

Feature gates and extra usage

Rosie's $49 Professional plan includes 250 minutes and can send appointment links, while direct booking begins on its $149 Scale tier. Upfirst Starter advertises in-call texts, calendar booking and summaries. Trillet D2C has supported native calendar sync, emailed summaries and configurable SMS follow-up; outgoing SMS is separately billed, and CRM connections beyond named calendars are self-serve via API. Do not label other entry plans “voice only” or assume every feature in an agency/enterprise product is included in a $49 receptionist plan.

When “Cheap” Becomes Expensive

Suppose a plumber configures after-hours forwarding and the AI handles 40 three-minute calls in one month, or 120 minutes. Dialzara Lite would be $29 + 60 × $0.48 = $57.80; Trillet would be $49 within its 150-minute inclusion. If that same example doubles to 80 calls, or 240 minutes, Dialzara's cheaper published route is Pro at $108, while Trillet is $67. These are illustrative voice-plan subtotals, not a revenue forecast. Adding text messages, phone-number or forwarding charges can change an invoice.

The extra calls can be welcome business, but there is no evidence here that any vendor sets its base price to deceive customers or depends mainly on overages for profit. The practical protection is to forecast a normal and busy month, examine each tier and check what the invoice meters.

How to Calculate Your Real Monthly Cost

Pull three months of call logs. Separate calls answered by staff from calls likely to reach the AI.
Count eligible calls, distinct callers and AI-handled minutes separately. If using call length × call count, round and account for busy periods.
For each minute plan, calculate base fee + max(0, minutes − included minutes) × extra-minute rate. For per-call or unique-customer plans, replace “minutes” with that provider's billable unit.
Compare all applicable tiers. At 240 minutes, Dialzara Lite is $115.40 but Pro is $108.
Add separately billed SMS, phone numbers, forwarding, transfers, taxes and required add-ons. Confirm any refund, renewal or cancellation terms.

At 400 minutes, Trillet is $99, Dialzara Pro is $180 and Goodcall is either $79 or more depending on unique callers. The statement “a $49 plan always costs less than a $29 plan” is not a general rule; the mix and chosen tier decide.

Frequently Asked Questions

Which AI receptionist has the lowest overage rate?

There is no stable market-wide winner. Trillet's published D2C overage is $0.20/minute, and Echowin also advertises $0.20/minute pay-as-you-go voice with a separate $10/month number charge. Other providers price by call, unique customer or selected minute tier. Compare current checkout totals for your usage.

Does Trillet have overage charges, or is it unlimited?

Trillet is not unlimited. The $49 D2C plan includes 150 minutes and adds $0.20 per minute beyond that. At 200 minutes, its plan-and-minute subtotal is $59 before separately billed extras.

Why do AI receptionist plans include so few minutes?

Plans target different call volumes and price points. A low included allowance can suit overflow-only use; it can also produce overage on an all-call route. The public price alone does not reveal a provider's motives or margin.

Is per-call or per-minute billing better for small businesses?

It depends on average duration and call count. Per-call can favor long conversations and fewer calls. Per-minute can favor brief interactions. Goodcall's unique-customer model may favor repeat callers. Use your own logs.

How many minutes does a typical small business use per month?

There is no reliable one-size-fits-all figure in this guide. Check how many calls will reach your AI and how long those calls last. Do not use emergency-triage assumptions for a self-serve receptionist; retain a human fallback for urgent or safety-sensitive situations.

Does Trillet charge overage automatically or require a plan upgrade?

The published D2C plan charges $0.20/minute beyond 150, with no required plan upgrade. At 200 minutes, that is $59 for the plan and AI minutes. It is not a promise of uninterrupted service, and SMS or other applicable charges are separate. The plan carries a 28-day money-back guarantee, not a free trial; see current terms.