CallSky Logo CallSky.io

International Calling Guides & Articles

Expert guides on international calling, VoIP services, and choosing the best communication solutions for your needs.

7 Best International Calling Apps for Android in 2026

7 Best International Calling Apps for Android in 2026

Skype is gone. These 7 Android apps call real phone numbers in 180+ countries. We compared their published rates, features and terms.

Read more →
Your Complete Guide to Telstra Overseas Roaming

Your Complete Guide to Telstra Overseas Roaming

Navigate Telstra overseas roaming with confidence. Compare the International Day Pass, rates, and alternatives to find the best option for your trip.

Read more →
A Guide to Optus International Roaming for Australian Travellers

A Guide to Optus International Roaming for Australian Travellers

Understand Optus International Roaming with our complete guide. Compare daily packs, rates, and smart alternatives to avoid bill shock on your next trip abroad.

Read more →
A Simple UK Guide to Vodafone International Calls

A Simple UK Guide to Vodafone International Calls

Vodafone UK international calls and roaming in 2026: standard rates, International Saver and Call Abroad Extras, roaming zones and daily charges, checked against Vodafone's own pages.

Read more →
Tesco International Calling: a Complete Guide for UK Users

Tesco International Calling: a Complete Guide for UK Users

Your complete guide to Tesco international calling. We break down the costs, roaming rules, and why a VoIP service like CallSky can be a smarter choice.

Read more →
A UK Guide to EE International Calls: Rates, Roaming & Add-Ons

A UK Guide to EE International Calls: Rates, Roaming & Add-Ons

EE charges 25p/min to Europe and £4.64/min to the USA, India and most of the world, per its own price guide. Every scenario priced, with cheaper routes.

Read more →
Your Complete Guide to O2 International Calls

Your Complete Guide to O2 International Calls

O2 charges 23p/min to Europe but £4.10/min to almost everywhere else on Pay Monthly (more than PAYG pays). Verified rates, the voicemail trap, and cheaper routes.

Read more →
Google Voice Cost: a Comprehensive Guide to Its Pricing

Google Voice Cost: a Comprehensive Guide to Its Pricing

Google Voice is free for personal calls in the US. Paid plans cost $10, $20 or $30 a month. How international calls, credit, porting fees and number rules work.

Read more →
Spectrum International Calling: Your Ultimate Guide

Spectrum International Calling: Your Ultimate Guide

What Spectrum Mobile and Spectrum Voice include for calls to Canada and Mexico, how roaming works on each Spectrum Mobile plan, and when a calling app costs less.

Read more →
Google Fi International Calling: Rates, Roaming, and Cheaper Alternatives

Google Fi International Calling: Rates, Roaming, and Cheaper Alternatives

Explore Google Fi international calling: learn US rates, roaming options, and tips to save on international calls.

Read more →
Three UK International Calls: a Guide to Rates and Cheaper Alternatives

Three UK International Calls: a Guide to Rates and Cheaper Alternatives

Confused about Three UK international calls? Our guide breaks down the high rates, explains Go Roam, and shows you how to save money on calls abroad.

Read more →
A Guide to US Mobile International Calling & Alternatives

A Guide to US Mobile International Calling & Alternatives

US Mobile includes calls to most countries on most plans, with monthly caps for some. What each plan includes, the $3 add-on, roaming, and the caps.

Read more →
11 Best Google Voice Alternatives (for Non-US Users & Businesses)

11 Best Google Voice Alternatives (for Non-US Users & Businesses)

Google Voice requires a US number to sign up. These 12 alternatives cover non-US users, businesses, and international calling.

Read more →
Your Comprehensive Guide to Verizon International Calling Rates

Your Comprehensive Guide to Verizon International Calling Rates

Tired of confusing Verizon international calling rates? This guide demystifies TravelPass, monthly plans, and pay-per-use fees to help you save.

Read more →
A Budget-Friendly Guide to Cricket International Calling

A Budget-Friendly Guide to Cricket International Calling

Compare Cricket international calling options, rates, and add-ons. Learn how to save on cheap, high-quality calls worldwide.

Read more →
Visible International Calling: a Guide to Rates, Rules, and Saving Money

Visible International Calling: a Guide to Rates, Rules, and Saving Money

What each Visible plan includes for international calls: unlimited Mexico and Canada on every plan, 500 minutes to 85+ countries on Visible+ Pro, and when an app costs less.

Read more →
AT&T International Day Pass: Real Costs & Billing Traps

AT&T International Day Pass: Real Costs & Billing Traps

AT&T International Day Pass costs $12/day ($6 extra lines), capped at 10 charges per line per bill cycle. The three billing traps, and what a real trip costs.

Read more →
Your Guide to T-Mobile International Calling Rates and Plans

Your Guide to T-Mobile International Calling Rates and Plans

T-Mobile international calling in 2026: what Essentials, Experience More and Experience Beyond include abroad, $0.50/min roaming calls, passes, and Stateside International Talk.

Read more →
How to Call Without a SIM Card: a Practical Guide for Travelers

How to Call Without a SIM Card: a Practical Guide for Travelers

Learn how to call without sim using WiFi Calling and VoIP apps, perfect for travelers who need reliable calls when cellular service is unavailable.

Read more →
Skype Alternatives for International Calls: What Replaces SkypeOut

Skype Alternatives for International Calls: What Replaces SkypeOut

Compare SkypeOut replacements for calls to landlines and mobiles, with updated CallSky starting prices and advice on prepaid credit, expiry and monthly plans.

Read more →
Skype Alternatives for International Calls: What Replaces SkypeOut

Skype Alternatives for International Calls: What Replaces SkypeOut

Compare SkypeOut replacements for calls to landlines and mobiles, with updated CallSky starting prices and advice on prepaid credit, expiry and monthly plans.

Read more →
What Is WiFi Calling and How Does It Actually Work?

What Is WiFi Calling and How Does It Actually Work?

How WiFi calling works, how to turn it on for iPhone and Android, how carriers bill WiFi calls abroad, and how it differs from WhatsApp and calling apps.

Read more →
WiFi Calling Not Working? Here Are the Real Fixes for iPhone & Android

WiFi Calling Not Working? Here Are the Real Fixes for iPhone & Android

Is your WiFi calling not working on iPhone or Android? Jump into our guide for practical fixes that solve the most common issues and get your calls connected.

Read more →
Are WhatsApp Phone Calls Free and What's the Catch

Are WhatsApp Phone Calls Free and What's the Catch

WhatsApp charges nothing for calls, but mobile data and roaming can cost you, and it cannot reach landlines or emergency numbers. What to check before you call.

Read more →
Apps for cheap international calls: prices and monthly costs

Apps for cheap international calls: prices and monthly costs

Compare CallSky international calling starting prices, estimate monthly costs, and check when prepaid credit, a subscription or free app calls fit your needs.

Read more →
How to Make International Calls: Complete Guide

How to Make International Calls: Complete Guide

Discover how to make international calls with low-cost options, top apps, and simple steps to stay connected worldwide.

Read more →
How to Dial US Numbers: A Complete Guide

How to Dial US Numbers: A Complete Guide

Learn how to dial US numbers from anywhere. This guide covers international exit codes, US country code, area codes, and modern calling apps.

Read more →
Skype Alternatives for International Calls: What Replaces SkypeOut

Skype Alternatives for International Calls: What Replaces SkypeOut

Compare SkypeOut replacements for calls to landlines and mobiles, with updated CallSky starting prices and advice on prepaid credit, expiry and monthly plans.

Read more →
Best App for WiFi Calling: An Honest Guide

Best App for WiFi Calling: An Honest Guide

Your phone likely has WiFi calling built in. The team behind a calling app explains when that's enough, when an app is worth installing, and what each option costs.

Read more →