Cómo llamar a India desde el Reino Unido

The dial string is `+91` followed by the 10-digit Indian number with the leading `0` dropped. Indian toll-free numbers, anything starting `1800`, `1860`, or `1075`, are domestic only and will not connect from a UK number. Indian mobiles dominate; landlines outside the top six cities are mostly inactive.

The dial string

To call India from the UK, dial:

• ›`+91 {area code or mobile prefix} {number}`, or
• ›`00 91 {area code or mobile prefix} {number}` from a UK landline that prefers the international access prefix.

Drop the leading `0` from the Indian number. A Bengaluru mobile printed as `09876 543210` is dialled as `+91 98765 43210`. A New Delhi landline printed as `011 2345 6789` is dialled as `+91 11 2345 6789`.

The carrier-specific international dialing prefixes (`00`, `001`, `0011`) that older guides recommend are an artefact of British Telecom's pre-2008 routing. Every UK carrier today resolves `+` and `00` identically.

Mobile vs landline

Indian mobile numbers are 10 digits starting `6`, `7`, `8`, or `9`. Mobiles account for over 95% of active Indian numbers; if you have a 10-digit number with no separator, it is almost certainly a mobile.

Indian landlines vary by city. The STD (Subscriber Trunk Dialing) code is 2 digits for the largest cities (Mumbai `22`, Delhi `11`, Bengaluru `80`, Chennai `44`, Kolkata `33`, Hyderabad `40`), 3 digits for tier-2 cities (Pune `20`, Ahmedabad `79`), and up to 4 digits for smaller towns. The subscriber number is 6-8 digits depending on the city's exchange.

India does not bill the receiver for incoming international calls. Whoever you are calling pays nothing for your call.

What it costs

Four realistic routes for a UK→India call in 2026:

• ›UK mobile international add-on. Vodafone UK's Stay Connected pass and EE's Roam Like at Home both exclude India from their standard inclusive plans; per-minute rates without an add-on sit at £1.00, £1.50/min to Indian mobiles. (See your carrier's international rate sheet.)
• ›Pre-paid international calling card. £5, £10 cards aimed at the South Asian diaspora advertise sub-1p rates to India. The advertised rate excludes the connection fee and short-call rounding, which often doubles the effective price on calls under 5 minutes.
• ›VoIP app-to-phone. Skype's successor Microsoft Teams Phone and Viber Out both terminate calls to Indian mobiles at around £0.025/min, charged from a pre-paid balance. Both require app installation and account creation.
• ›Browser-to-phone via WorldDial. £0.019/min to Indian mobiles, £0.013/min to Indian landlines, billed per second. No app, no SIM, works from any browser.

If you call India for more than 10 minutes a month, the UK carrier add-on loses to all three alternatives. For short, frequent calls, the per-second billing of a browser-to-phone service usually beats a pre-paid card's connection fee.

Toll-free numbers from this corridor

Indian toll-free numbers start `1800` (and `1860`, `1075`). They are funded by the Indian called party and routed exclusively through the Indian domestic toll-free network. They will not connect from a UK number on any carrier or app.

Most Indian banks and government services that publish a `1800` number also publish a separate paid international number on the same contact page, usually a Mumbai or Delhi landline (`+91 22 …` or `+91 11 …`). HDFC Bank's international card-services line is `+91 22 6160 6161`; State Bank of India publishes `+91 22 2274 7606`; Passport Seva's international helpdesk is `+91 40 6717 3500`. Always look for the paid international number when the toll-free one is the only one your search returned.

Best calling windows

India Standard Time is UTC+5:30. UK time is UTC+0 (winter) or UTC+1 (BST, summer). India runs 5h30 ahead of UK in winter, 4h30 ahead in summer.

The best window for reaching a human on an Indian helpline (banking, government, telco) is `10:00-12:30 IST`, the first 2.5 hours of the Indian working day, when queues are shortest. In UK time that maps to `04:30-07:00` GMT or `05:30-08:00` BST. Set an early alarm or call from the night shift.

The window to avoid is `14:00-16:00 IST` (Indian afternoon, post-lunch surge) which maps to `08:30-10:30 UK morning`. Calling during a UK breakfast hits an Indian queue at its worst.

Pitfalls specific to this corridor

• ›Aadhaar and bank IVRs require Indian-mobile OTP. Most Indian banks and government services route identity verification through SMS to a registered Indian mobile number. If you call from the UK to dispute a transaction or request a password reset, the agent will offer to send an OTP to your registered Indian mobile, if that SIM is in a drawer at your parents' house in Bengaluru, the verification fails. Plan for this before you call: keep an Indian eSIM or a forwarding service active.
• ›DTMF delivery on VoIP routes is inconsistent. Indian bank IVR menus are deep, 4-6 levels, and require touch-tone (DTMF) input that some VoIP-to-PSTN bridges deliver imperfectly. The symptom is the IVR repeatedly saying "Sorry, I didn't catch that." WorldDial supports clean DTMF; test on the menu before a long call.
• ›Indian regulators throttle some international VoIP termination. TRAI's rules on international long-distance carriers mean that VoIP-to-PSTN calls land via a small set of approved gateways. Some carriers see intermittent silent-audio issues on outbound legs to Indian landlines. If a call connects and the line is silent, hang up and redial; the second attempt usually routes via a different gateway.
• ›WhatsApp calling is not a reliable replacement. WhatsApp voice calls have been intermittently blocked or throttled at the network layer by several Indian ISPs since 2023, especially during political events. If you need to reach a phone number that is not on WhatsApp (most Indian banks, all government offices), only the PSTN route works.

Quick checklist

• ›Have the destination number in international format: `+91` followed by 10 digits.
• ›Drop the leading `0` from the Indian number before adding `+91`.
• ›Pick a window that hits Indian office hours: aim for 10:00-12:30 IST.
• ›Have your reference number, customer ID, and Indian-mobile-linked OTP ready before dialing.
• ›Use a per-minute paid route; the toll-free `1800` numbers will not connect.

FAQs

What is the international dialing code for India?

`+91`. From the UK, dial `+91` or `00 91`, then the 10-digit Indian number with the leading `0` dropped.

Can I dial Indian 1800 toll-free numbers from the UK?

No. Indian `1800` and `1860` toll-free numbers are domestic-only. The international carrier has no way to bill the call back to the Indian toll-free provider, so the call either rings forever or returns a "this call cannot be completed" tone. Look for the paid international number on the same contact page, usually a Mumbai or Delhi landline.

What's the cheapest way to call India from the UK?

Browser-to-phone services bill per second at around £0.019/min to Indian mobiles. Pre-paid calling cards advertise lower rates but include connection fees that double the effective cost on calls under 5 minutes. UK carrier international add-ons remain the most expensive route, usually 50-80x the per-minute cost of the alternatives.

Will WhatsApp work for my India call?

Only if the person you are calling is on WhatsApp and is willing to take a voice call there. Government offices, banks, and most institutions in India do not run WhatsApp lines for customer service. Several Indian ISPs throttle WhatsApp calls at the network layer during politically sensitive periods. For a phone number, you need a phone-network call.

Why does the call connect but I hear nothing?

The most common cause on this corridor is a one-way audio failure on the outbound leg through an Indian gateway. Hang up immediately and redial, the next call usually routes via a different gateway. If the silent-audio failure repeats three times, try a different calling route or app entirely.