Free AI phone agents in 2026: real free tiers, trial credits, and what they include
A “free AI phone agent” usually means one of three things: a recurring free plan, a one-time block of trial credits, or an agent builder that is free until you place a real call.
Only a few platforms publish genuine recurring free tiers. Phonely includes 100 minutes per month, while Smith.ai’s AI Receptionist includes 25 calls per month. Phonely pricing, accessed 2026-09-01. Smith.ai AI Receptionist pricing, accessed 2026-09-01.
Trial credits are more common. Retell advertises $10 in free credits, Telnyx provides $25 in AI credits during pretrial, and Bland offers “two credits” without publishing their dollar value. Other vendors mention free evaluation without publishing enough information to calculate what it includes.
For most active business lines, these free blocks end quickly. The useful comparison is therefore not simply “Which platform is free?” It is “What happens at the limit, and what will my normal monthly workload cost?”
Genuine recurring free tiers
Phonely Free
Phonely’s Free plan includes 100 minutes per month, approximately 50 calls, and one phone number. It has no overage path. When the account reaches the limit, the customer must upgrade rather than continue at a per-minute Free-tier rate. Phonely pricing, accessed 2026-09-01.
The first paid plan is Starter at $50 per month on monthly billing. Its plan card currently says 200 included minutes, while the comparison table on the same page says 250. The published monthly overage rate is $0.25 per minute. Under the annual toggle, Starter is $33 per month but displays a higher $0.35-per-minute overage rate. Confirm the included-minute allowance and overage treatment before buying. Phonely pricing, accessed 2026-09-01.
Phonely’s free plan is therefore useful for testing or a very quiet line, but the transition is a tier upgrade rather than seamless pay-as-you-go overage. See the full mechanics in the Phonely pricing guide.
Smith.ai AI Receptionist Free
Smith.ai’s AI Receptionist has a $0-per-month Free plan with 25 calls per month. Additional calls on that plan cost $3.00 each. Its paid options are also priced per call rather than per connected minute, so call length must be assumed before comparing it with minute-based services. Smith.ai AI Receptionist pricing, accessed 2026-09-01.
Do not confuse this product with Smith.ai’s separately priced, human-staffed Virtual Receptionist service. They have different pricing pages and different rates. The recurring free plan described here belongs to the AI Receptionist product.
One-time trial credits and incomplete free offers
Retell AI: $10 in credits
Retell advertises “$10 in free credits” and an all-in range of $0.07 to $0.31 per minute. Retell pricing, accessed 2026-09-01.
Illustrative arithmetic, not a quote: at the high end, $10 ÷ $0.31 = 32.258..., or roughly 32 whole minutes. At the low end, $10 ÷ $0.07 = 142.857..., or roughly 142 whole minutes. The practical result is therefore about 32 to 142 minutes, depending on the selected model, voice, telephony, and add-ons.
Telnyx: $25 in AI credits
Telnyx’s pretrial provides $25 in AI-product credits, requires no card, and includes one US local number. When the account upgrades, the $25 AI credit is replaced by a $5 credit that can be used across Telnyx products. Telnyx Voice AI pricing, accessed 2026-09-01. Telnyx pretrial-account documentation, accessed 2026-09-01.
How many complete calls that buys depends on the configured voice-agent components and telephony. Treat the credit as an evaluation budget, not as a recurring free allowance.
Bland AI: two credits of undefined value
Bland says signup includes two credits plus an inbound number valued at $15 per month, with no card required. Its pricing page does not define the dollar value of one credit, so there is no defensible way to convert the offer into minutes or calls from the published information. Bland pricing, accessed 2026-09-01.
Vapi and Goodcall: missing trial details
Vapi’s pricing FAQ includes a heading about trying the service for free, but the free-credit amount is not retrievable from the published pricing page. A specific Vapi credit figure should not be assumed. Vapi pricing, accessed 2026-09-01.
Goodcall’s pricing-page title mentions a free trial, but the page body does not publish the trial’s duration or inclusions. Ask for the current terms before treating it as part of a cost comparison. Goodcall pricing, accessed 2026-09-01.
What to test while usage is free
A free block is best used for evaluation rather than low-stakes chatting with the agent. Run a compact test set that resembles the calls your business actually receives:
- Barge-in: interrupt the agent naturally and check whether the conversation recovers.
- Transfers: test a successful transfer, an unavailable destination, and an after-hours route.
- Voicemail handling: verify the intended option: let the agent prompt decide, hang up, or leave a configured message.
- Knowledge retrieval: ask one real question whose answer depends on your policies, catalog, or operating details.
- After-hours behavior: call outside business hours and confirm the promised message, routing, and follow-up.
Record what passed, revise the configuration, and repeat the same scenarios. The point is to discover whether the agent handles your workflow before the free allowance disappears. The voice-agent testing guide provides a broader evaluation framework.
What happens after free usage ends
Use a small-business workload of 300 calls × 4 connected minutes = 1,200 connected minutes per month. Every calculation below is illustrative and not a quote. Phone-number, telephony, language, and configuration choices can change the result.
| Platform | Free block | What starts paid usage | Illustrative price at 1,200 minutes |
|---|---|---|---|
| ThunderPhone Spark | Building agents is free; no free tier for real phone calls | Payment method and at least $3 prepaid | 1,200 × $0.02 = $24 for the base engine; telephony depends on setup |
| Phonely | 100 minutes per month, then upgrade required | Starter begins at $50/month | Using the Pro card’s 650-minute allowance: $150 + (1,200 − 650) × $0.30 = $150 + $165 = $315. The same page’s 750-minute table would instead produce $150 + (1,200 − 750) × $0.30 = $285. Phonely pricing, accessed 2026-09-01. |
| Smith.ai AI Receptionist | 25 calls per month | $3.00 for each additional Free-plan call | At the stated 300-call workload, the published 300-call Pro option is $500/month. Smith.ai AI Receptionist pricing, accessed 2026-09-01. |
| Retell AI | $10 in one-time credits | Pay-as-you-go usage after credits | Using the advertised range: 1,200 × $0.07 = $84 to 1,200 × $0.31 = $372, before considering the exact configuration. Retell pricing, accessed 2026-09-01. |
ThunderPhone does not offer free real-call minutes. Signing up and building agents is free, but real calls require a payment method and at least $3.00 in prepaid balance. Funds do not expire. Illustrative arithmetic, not a quote: $3.00 ÷ $0.02 = 150 Spark base-engine minutes. Optional voice or language paths, other configured additions, and setup-dependent telephony can reduce the number of complete minutes that balance supports.
In this defined scenario, ThunderPhone’s published Spark arithmetic is lowest among the four rows. That is a scoped workload comparison, not a universal ranking. Call length, language, call mix, and configuration can reorder the results, so rerun the arithmetic with your own usage.
FAQ
Is there a completely free AI phone agent?
There are recurring free plans, but not unlimited free business usage. Phonely includes 100 minutes per month and stops at the limit; Smith.ai’s AI Receptionist includes 25 calls and then charges $3.00 per additional call. Phonely pricing, accessed 2026-09-01. Smith.ai AI Receptionist pricing, accessed 2026-09-01.
Which AI receptionist has a free plan?
Phonely and Smith.ai publish genuine recurring free plans. Phonely’s is minute-based at 100 minutes per month, while Smith.ai’s AI Receptionist is call-based at 25 calls per month. Their upgrade mechanics differ, so compare the paid tier or overage that follows the free block. Phonely pricing, accessed 2026-09-01. Smith.ai AI Receptionist pricing, accessed 2026-09-01.
How far do trial credits go?
It depends on the configured rate. Retell’s $10 credit equates to roughly 32 to 142 minutes across its advertised $0.31-to-$0.07 range. That arithmetic is illustrative and not a quote: $10 ÷ $0.31 = 32.258... and $10 ÷ $0.07 = 142.857.... Telnyx publishes $25 in pretrial AI credits, while Bland does not define the value of its two signup credits. Retell pricing, Telnyx Voice AI pricing, and Bland pricing, accessed 2026-09-01.
What should I test before paying?
Test interruption handling, transfers, voicemail behavior, a real knowledge question, and after-hours routing. Use repeatable scenarios and test failure paths, not just a successful scripted conversation. For voicemail, verify all relevant choices: let the agent prompt decide, hang up, or leave a configured message.
Does ThunderPhone have a free trial?
Building an agent is free, but ThunderPhone does not offer a free tier for real phone calls. Real calls require a payment method and at least $3.00 in prepaid balance. At Spark’s 2¢ base-engine rate, $3.00 ÷ $0.02 = 150 minutes of testing is the illustrative arithmetic, not a quote; configured additions and telephony can change the complete cost. See ThunderPhone pricing.
Sources and freshness
Third-party free-tier and trial details were checked against the linked vendor pages on September 1, 2026. ThunderPhone pricing and product details reflect its published information as of the same date. No vendor account, invoice, or live trial was tested.
Several gaps are intentional: Vapi’s published page does not expose a free-credit amount, Goodcall does not publish trial terms in the pricing-page body, Bland does not define the value of a credit, and Phonely’s plan cards disagree with its comparison table about included paid-plan minutes. Confirm any offer against the vendor’s live pricing page before relying on it.