Best VoIP Apps for iPhone: Complete Comparison Guide

Top VoIP Apps for iOS

Choosing the right voip app for iPhone depends on what you need: low-cost international calls, a dedicated business number, or a softphone that connects to your company’s SIP server. Below are widely used apps that cover those needs, with quick notes on what each does best.

• Skype: Calls mobiles and landlines in most countries, offers video and SMS, and works on iPhone, iPad, and Mac. Good for occasional international PSTN calls and presence across platforms.
• Google Voice: Best if you need a free US number tied to Google services. Calls to international numbers cost extra; Android and iOS apps support calling and texting in the US.
• Viber (Viber Out): Lets you call real phone numbers with Viber Out credit. Strong for international calling if your contacts also use Viber for messaging.
• Vonage Mobile: Provides a mobile app linked to Vonage accounts; includes inbound numbers and business features for SMBs.
• RingCentral and Zoom Phone: Business-grade VoIP phone apps with managed phone numbers, call routing, and integrations. They require paid subscriptions for PSTN numbers.
• Zoiper and Bria (CounterPath): SIP client apps for iPhone, iPad, and Mac that let you connect to any SIP-based VoIP provider or PBX. Good for users who want full SIP customization.
• Rebtel: Focuses on low-cost international calling with local routes and no app-to-app restrictions.
• Voipfone mobile app: A solid option for UK-based businesses using Voipfone service; supports business features and direct number provisioning.
• Telvio: A mobile VoIP app for iPhone and Android that calls real phone numbers in 200+ countries using WiFi or mobile data. Telvio charges from $0.02/min to the US, $0.08/min to India, bills per second with no connection fees, and offers credit packs from $1.99 to $9.99. It requires no registration, credits never expire, and new installs get 1 free minute.

If you want a quick comparison of how VoIP compares to other online calling options (video-first platforms, for example), see our guide to free online video calling platforms: /guide/free-online-video-calling-platforms/.

Features Comparison

When comparing voip iphone apps, evaluate five core areas: PSTN access (calling real phone numbers), number provisioning, SMS support, SIP support, and platform coverage (iPhone, iPad, Mac).

• PSTN calling and rates
  • Skype and Viber Out let you call landlines and mobiles. Rates vary by country.
  • Telvio provides clear pay-as-you-go rates: $0.02/min to the US, $0.08/min to India, with per-second billing and no connection fees.
  • Google Voice provides a US number with competitive domestic rates and separate international pricing.
• Number provisioning
  • RingCentral, Vonage, and Google Voice can assign a persistent phone number to your account.
  • Softphone apps like Zoiper and Bria rely on an external SIP provider to provide numbers.
• SIP and PBX support
  • Zoiper, Bria, and other SIP clients support SIP accounts and allow you to register to business systems. If you run a PBX or use a business VoIP provider, these apps act as a standard voip client mac and iOS.
  • Voipfone mobile app is designed to integrate with Voipfone’s business services and supports standard business features.
• SMS and extra features
  • Google Voice gives integrated SMS for US numbers. Skype offers SMS but at cost.
  • Business apps (RingCentral, Vonage) offer voicemail-to-email, call queues, and team features.
• Platform compatibility
  • Most mainstream apps support iPhone and iPad. Many offer Mac or web clients; Zoiper and Bria are available as voip app for mac and desktop softphones.

If you need to understand the underlying services and why features differ across providers, read our explainer: /guide/voip-phone-services-explained/. For a business-centered comparison, see /compare/business-voip-phone-systems-comparison/.

Practical tip: If you need a mobile-first solution to call family abroad, focus on PSTN rates and per-second billing. If you need business features, prioritize number provisioning, call routing, and integrations.

Installation and Setup Guide

Getting a voip phone app for iPhone running typically takes 5–10 minutes for consumer apps and 10–30 minutes for SIP or business setups.

1. Choose the app
   • Search the App Store for terms like "voip app for iphone", "voip phone app for iphone", or the provider name (Skype, Zoiper, Telvio).
2. Install and grant permissions
   • Install the app, then allow microphone access and notifications when prompted. iOS requires microphone permission for calls.
3. Create an account or skip registration
   • Consumer apps usually require a simple sign-up (email or phone). Telvio lets you make calls without registration, so you can start immediately and use the 1 free minute on first install.
4. Add credit or configure billing
   • For pay-as-you-go services, add credit. Telvio offers Starter $1.99, Standard $4.99, and Pro $9.99 packs, and credits never expire.
   • For services with monthly plans, choose the plan that fits call volume.
5. Configure SIP (if using a SIP client)
   • If you use Zoiper, Bria, or a voip client mac, enter your SIP username, password, and server details provided by your VoIP provider.
   • Test registration and place a test call to verify codecs and connectivity.
6. Test call quality
   • Make a short call to a nearby number and to an international contact to check latency and audio clarity. If calls crackle, switch from mobile data to WiFi or vice versa, or change the codec (in SIP clients).

For step-by-step guidance on making international calls and picking the right app for cross-border calling, see /guide/how-to-make-international-calls/. If you’re deciding whether to use VoIP or another calling method, our comparison of international calling cards can help you weigh costs: /compare/international-calling-cards-comparison/.

Performance and Call Quality

Call quality on a voip smartphone depends on three main factors: network conditions, codec and app implementation, and the route the provider uses to reach the PSTN.

• Network conditions
  • Use WiFi when possible for more stable bandwidth. On mobile data, prefer LTE or 5G over weak 3G. Latency above 150 ms can make conversation awkward.
  • Packet loss above 1–2% affects audio; jitter buffers in apps help but can introduce delay.
• Codec support
  • Most consumer apps use a mix of codecs (Opus, G.711) that balance quality and bandwidth. Softphones might allow you to prioritize codecs for better results on constrained networks.
• Provider routing
  • Some providers use direct local routes to reduce latency and improve audio. Telvio, for example, routes calls to 200+ countries and focuses on low per-minute rates; route quality influences clarity.
• Device hardware
  • Newer iPhones and iPads have better microphones and noise cancellation. Use wired or Bluetooth headsets for consistent results in noisy environments.
• Real-world examples
  • On a stable home WiFi connection (20 Mbps down / 5 Mbps up), expect near-landline quality on Opus or G.711 with latency <100 ms.
  • On a crowded cafe WiFi, you may see jitter and brief dropouts; switching to LTE often helps if the cellular signal is strong.

Testing tips:

• Run a short test call each time you switch networks.
• If you run a business, consider a paid plan on RingCentral or Vonage for SLA-backed performance.
• For ad-hoc international calls, a pay-as-you-go app with per-second billing like Telvio keeps costs predictable while offering low rates.

If you need a quick checklist for choosing between video-first platforms and VoIP calls, our free online video calling platforms guide can help you pick the right tool for meetings versus PSTN calling: /guide/free-online-video-calling-platforms/.

Pricing and Subscription Options

Pricing models vary. Expect one of these models across apps: pay-as-you-go credits, monthly subscription, or free app-to-app calling with paid PSTN minutes.

• Pay-as-you-go (credits)
  • Telvio: Credits never expire. Packs: Starter $1.99, Standard $4.99, Pro $9.99. Per-second billing, no connection fees. Rates from $0.02/min to the US and $0.08/min to India. First install includes 1 free minute.
  • Viber Out and Skype sell credit bundles you top up and spend per minute.
• Monthly subscriptions
  • RingCentral, Vonage, and Zoom Phone sell monthly plans that include minutes and business features; better for consistent business usage and team features.
  • Google Voice offers a free personal option for US users and paid options for business use.
• Toll-free and local numbers
  • Business providers charge monthly fees for local or toll-free numbers. Add-ons like call recording, voicemail-to-email, and advanced routing often cost more.
• SIP-based pricing
  • If you use a SIP provider with Zoiper or Bria, you typically buy a plan from the provider that includes a phone number and minutes. The softphone itself may be free or paid.
• Hidden costs to watch for
  • Connection fees: most reputable VoIP apps advertise per-minute rates without a connection fee; confirm before calling.
  • Billing increments: Telvio bills per second. Other services bill per minute or with a rounding policy—read the fine print.
  • International surge rates: rates can change; check the provider’s rate table before placing many calls.

Cost examples

• 60-minute international call to the US on Telvio: 60 × $0.02 = $1.20 (billed per second, so exactly $1.20).
• Same 60 minutes to India on Telvio: 60 × $0.08 = $4.80.
• Skype may cost different amounts depending on region; check in-app rates.

For businesses comparing VoIP phone systems and ongoing monthly costs, see /compare/business-voip-phone-systems-comparison/. If you mostly make international calls and want to compare with calling card prices, our comparison can be useful: /compare/international-calling-cards-comparison/.