How To Avoid Roaming Charges While Travelling Abroad

Roaming charges can accumulate quickly outside the UK, especially on longer trips. Understanding your connectivity options helps you stay in touch without facing unexpected bills. This guide explains the main approaches, their practical applications, and the trade-offs involved. This article forms part of our SIMs & Connectivity for Long Term Family Travel Complete Guide.

Understanding why roaming charges exist

When using a UK mobile abroad, your network connects through a foreign operator that charges for access. These costs are passed to you. Since Brexit, UK travellers to the EU no longer enjoy automatic roaming protections. While some networks still offer inclusive EU roaming, many have reintroduced daily charges or caps. Outside Europe, costs are typically much higher.

Option 1: Using your UK network’s roaming packages

Most networks offer “bolt-ons” -either daily passes or monthly bundles. This is the simplest approach as it requires no setup and lets you keep your UK number active for apps and calls.

Pros:

  • No setup; works immediately upon landing.

  • Keeps your UK number active for calls and 2FA.

  • Predictable costs.

Cons:

  • Often more expensive than local alternatives for long stays.

  • Data allowances are frequently limited.

  • Daily charges can stack up quickly.

Best for: Trips under two weeks or users who must remain reachable on their UK number.

Option 2: Local SIM cards

Buying a prepaid SIM in your destination provides a local number and domestic rates. This is the most cost-effective option for extended stays in a single country.

Pros:

  • Significantly cheaper for high data usage.

  • Better local coverage and no arbitrary caps.

  • Easy to top up locally.

Cons:

  • Requires an unlocked phone.

  • You temporarily lose access to your UK number (unless using a second device).

  • Registration may require a passport and proof of address.

Best for: Extended stays in one country.

Option 3: International travel SIM cards and eSIMs

Travel SIMs and digital eSIMs work across multiple countries. eSIMs are activated via your phone settings, removing the need for physical card swapping.

Pros:

  • One plan covers multiple countries.

  • Can be purchased and activated before departure.

  • Cheaper than standard roaming for multi-country trips.

Cons:

  • More expensive than local SIMs for long stays.

  • Requires an eSIM-compatible phone.

  • Most are “data-only,” meaning no traditional calls or texts.

Best for: Frequent border-crossing or multi-destination tours.

Option 4: Relying on WiFi only

The simplest way to avoid charges is to disable mobile data and use free WiFi in hotels and cafés.

Pros:

  • Completely free.

  • No technical setup or unlocking required.

Cons:

  • No connectivity between hotspots.

  • Public WiFi poses security risks; banking should be avoided without a VPN.

  • Difficult to navigate or use translation apps on the move.

Best for: Budget travellers who don’t mind being offline between locations.

Making the practical choice

  • Short breaks: UK roaming packages are usually the path of least resistance.

  • Long stays (e.g., one month): A local SIM offers the best value.

  • Multi-country trips: Travel eSIMs remove the friction of buying new SIMs at every border.

  • Families: Consider a portable WiFi hotspot to share one data plan across multiple devices.

Technical requirements to check before you travel

  1. Unlocking: Your phone must be unlocked to use non-UK SIMs. Contact your provider at least a week before travelling; they usually do this for free.

  2. eSIM Compatibility: Most phones released after 2020 (e.g., iPhone XS+, recent Pixel/Galaxy models) support eSIM. Budget or older models likely do not.

  3. Dual SIM: If your phone supports Dual SIM (physical or eSIM), you can keep your UK SIM active for texts while using a local SIM for data.

Handling the UK number problem

The main drawback of using a foreign SIM is missing security codes (2FA) or banking alerts sent to your UK number.

  • App-based 2FA: Switch to authentication apps (like Google Authenticator) instead of SMS.

  • WiFi Calling: Enable this on your UK SIM to receive texts and calls over WiFi without using mobile data.

  • Backup Device: Keep your UK SIM in an old phone to receive essential texts.

Real-world friction points

  • Registration: Local SIMs often require passport registration, which can take time to process.

  • Battery Drain: Dual SIM configurations drain battery faster as the phone maintains two connections.

  • Activation: Travel eSIMs occasionally fail to activate; always have a backup plan (like offline maps) for your arrival.

Cost comparison in practice

  • UK Roaming: £2–£6 daily, or £10–£15 for monthly EU bundles.

  • Local SIM: Typically £10–£25 for high data (20GB+) in Europe; cheaper in Asia/Latin America.

  • Travel eSIM: £20–£40 for 10GB–20GB across multiple countries.

Setting up before you leave

  • Unlock your phone and verify eSIM support early.

  • Purchase and test your eSIM activation while still in the UK.

  • Enable WiFi Calling in your phone settings.

  • Download offline maps (Google Maps or Maps.me) to navigate without using data.

  • Note emergency numbers and your network’s customer service contact details.

Emergency connectivity

Even if you plan to use WiFi only, keep your UK SIM available. Most countries allow emergency calls (e.g., 112 or 999) even without an active plan or credit. Store essential contact info-embassies, insurance, and accommodation-offline.

Final considerations

The best choice depends on your priorities. Local SIMs offer the lowest cost, while UK roaming offers the most convenience. For most modern travellers, a travel eSIM provides a balanced middle ground. Match your choice to your travel pattern rather than simply picking the cheapest option on paper. For help making the call check out our article comparing eSIMs & local SIMs.

Would you like me to create a summary checklist based on these steps to help you prepare for your next trip?