The Biggest Mobile Networks in the World, and Which One Your eSIM Uses Abroad

The biggest mobile network in the world is China Mobile, with about 1.01 billion mobile customers at the end of June 2026. India's Bharti Airtel and Reliance Jio come next, followed by China Telecom. Other large groups include Vodafone, América Movil (Claro and Telcel), Orange and MTN. For travellers, the more useful question is which local network your phone or travel eSIM actually connects to abroad. This guide covers both, with the networks listed on SimplySIM plans for 12 popular destinations.

Last checked: 27 October 2026. Customer numbers come from each company's latest published results and are dated. Operators count customers in different ways, so treat the table as a guide to scale, not an exact ranking, and check the linked sources for the latest figures.

The largest mobile operators by customers

Some groups report mobile customers, others report "accesses" or a combined figure for all services. We've noted which is which.

China Unicom is also one of the world's largest operators, but it reports a combined total of 1.31 billion "connectivity subscribers" (June 2026) that includes 773 million IoT connections, so it can't be compared directly with the figures above.

Multinational groups and their brands by country

One brand name can belong to different companies in different countries, and one company can trade under several names. Changes confirmed in 2024 to 2026 that matter to travellers:

• Vodafone. Vodafone Spain was sold to Zegona in May 2024 and keeps the Vodafone name under a brand licence of up to 10 years (Vodafone announcement). Vodafone Italia was sold to Swisscom at the end of 2024 and combined with Fastweb as Fastweb + Vodafone. In the UK, Vodafone and Three merged into VodafoneThree on 31 May 2025, 51 per cent owned by Vodafone and 49 per cent by CK Hutchison (Vodafone).
• Orange. Orange and MasMovil combined their Spanish businesses as MasOrange in 2024, and Orange completed its purchase of the remaining 50 per cent in June 2026, so it now owns MasOrange outright, including the Orange, Yoigo and MasMovil brands (Orange). In France, Orange, Bouygues Telecom and Free signed an agreement in June 2026 to buy and split SFR. It still needs competition approval, so SFR continues to operate for now.
• Telefonica. Trades as Movistar in Spain, O2 in Germany and Vivo in Brazil, and co-owns Virgin Media O2 in the UK. It has sold several of its Spanish-speaking Latin American units since 2025, including Argentina, so the local network in those countries is no longer part of the Telefonica group.
• Deutsche Telekom. Owns T-Mobile US and trades as Telekom in Germany. In Greece, Cosmote became Telekom on 8 September 2026, and phones there now show TELEKOM.GR as the network name (Deutsche Telekom). Prices and contracts did not change.
• America Movil. Claro across most of Latin America, Telcel in Mexico, and a controlling stake in Austria's A1 Group.
• CK Hutchison. The 3 brand in Austria, Denmark, Ireland and Sweden, WindTre in Italy, and a 49 per cent stake in VodafoneThree.
• VEON, MTN and Airtel Africa. VEON runs Jazz, Kyivstar, Beeline and Banglalink. MTN and Airtel Africa cover most of sub-Saharan Africa between them.
• Asian groups. Axiata's Malaysian business merged with Digi to form CelcomDigi, and its Indonesian XL merged with Smartfren as XLSmart. Singtel owns Singtel and Optus (Australia) and holds stakes in Airtel, Telkomsel and Thailand's AIS.

Why your UK network's partner abroad matters

When you roam on a UK SIM, your network uses roaming agreements with local operators, and your phone connects to one of those partners. Your UK network decides which partners you can use and what you pay. Ofcom advises checking your network's charges before you travel and warns that phones can roam onto a network across a nearby border by accident (Ofcom). Our UK roaming charges guide lists each network's current fees.

Don't assume a familiar brand means the same company. Vodafone in Spain is now owned by Zegona, Vodafone in Italy by Swisscom, and O2 in Germany is Telefonica, not Virgin Media O2. A UK Vodafone or O2 customer has no automatic right to the same deal on a same-name network abroad. Your own network's roaming page is the only reliable guide.

Which network does my eSIM use abroad?

A travel eSIM is a data plan from an operator, and it reaches the internet through a local network in one of two ways:

• Roaming profile. The eSIM belongs to an operator in another country and roams onto local partners. Many travel eSIMs, including most multi-country plans, work this way, which is how one plan can cover dozens of countries.
• Local profile. The eSIM is issued by, or on behalf of, a network in the country you are visiting, so it connects much as a local SIM would.

Either way, your phone can only use the networks the plan supports. That's why the network list on a plan is worth reading before you buy. If you know which networks are strongest where you are going, pick a plan that includes them. The list can also differ between plans for the same country: on 27 October 2026, SimplySIM's Spain 10GB plan listed Orange and Movistar, while its Spain unlimited plans listed Vodafone, Orange, Movistar and Yoigo.

How to see or choose which network your phone is on

• iPhone: go to Settings > Mobile Service, choose your travel eSIM line, then Network Selection. Leave Automatic on to let the phone choose, or turn it off and wait for the list of networks to appear. The current network name also shows in Control Centre.
• Google Pixel: Settings > Network and internet > SIMs, choose the eSIM, then turn off "Automatically select network" to pick one by hand.
• Samsung Galaxy: Settings > Connections > Mobile networks > Network operators, then turn off "Select automatically".

Menu names vary by software version, so look for the nearest match. Pick a network by hand only if the signal is poor or you keep landing on a weak network. Stick to networks your plan lists, and switch back to automatic if you move on, because a manually chosen network that goes out of range leaves you with no signal. If the data still won't work, run through our eSIM no-data checklist.

Networks in 12 popular destinations

The table shows the main mobile networks in each country and the networks listed on SimplySIM's 10GB, 30-day single-country plan. On 27 October 2026, SimplySIM plans included:

Unlimited and regional plans for the same country may list different networks, so check the product page before you buy. For more detail on individual countries, see our Spain, Greece and India eSIM guides.

A travel eSIM is data only. Keep your UK SIM on for calls and texts, turn off data roaming on it, and set the eSIM as your data line (our dual SIM settings guide shows how). Check your phone supports eSIM and is network-unlocked with our compatibility checker.

FAQs

Which is the biggest mobile network in the world?

China Mobile, with about 1.01 billion mobile customers at the end of June 2026. Bharti Airtel (681 million customers across 15 countries) and Reliance Jio (533 million) are next, both as of June 2026.

Which network is best in Spain?

It depends on where you are going and what you measure. Independent testers such as Opensignal publish regular reports on Spanish networks using real user data, so check the latest one for the areas you'll visit. For France, the regulator Arcep publishes coverage and speed maps at monreseaumobile.arcep.fr, and the US regulator publishes the FCC National Broadband Map.

Can I choose which network my eSIM uses?

Usually, yes. Turn off automatic network selection for the eSIM line and pick from the list, but only choose a network the plan supports. If you choose one that isn't on the plan, the eSIM won't connect.

Which countries have Vodafone?

Vodafone Group runs networks in nine European markets, including the UK (through VodafoneThree), Germany, Turkey, Portugal and Greece, and eight African markets through Vodacom and Vodafone Egypt. Vodafone Spain (Zegona) and Vodafone in Italy (Swisscom's Fastweb + Vodafone) use the name but are no longer owned by Vodafone Group.

Is Orange the same company in every country?

Mostly. Orange Group owns the Orange networks in France, Spain (through MasOrange), Belgium, Poland, Romania and many African and Middle Eastern countries. Orange in the UK became part of EE years ago, so it no longer exists as a UK network.

Why does my phone show a different network name from the one on my plan?

Networks rebrand and merge, and phones sometimes display a short code or old name. In Greece, for example, the former Cosmote network now shows as TELEKOM.GR. If you are connected and data works, the name doesn't matter.