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- Reviewed by countrycalling.codes editorial team
Dialing sequence, step by step
- 1
Start with + on a mobile, or 00 when the United Kingdom network requires an all-digit access prefix.
- 2
Add 91, the country calling code for India.
- 3
Add the destination national significant number. Remove a domestic trunk 0 before a fixed-line area code. Do not add a 0 before a ten-digit mobile number in international format.
Use +91 for a saved Indian contact. A UK line that requires an all-digit access string uses 00 91 and omits a domestic trunk 0 from an Indian fixed-line number.
Mobile and landline examples
X means a subscriber digit placeholder, so these patterns explain the transformation without publishing a private callable number. Save the + format; use the access-prefix format only for a call that starts in United Kingdom.
| Number type | Domestic in India | Save on mobile | Dial from United Kingdom |
|---|---|---|---|
| Mobile | 9XXX XXX XXX | +91 9XXX XXX XXX | 00 91 9XXX XXX XXX |
| Landline | 011 XXXXXXXX | +91 11 XXXXXXXX | 00 91 11 XXXXXXXX |
How the international format is built
Portable contact format
+ 91 + national significant number
The + represents international access. It is display notation, not one of the E.164 digits.
Digits-only call from United Kingdom
00 + 91 + national significant number
The first part routes out of the origin network and must not be stored as part of the destination.
E.164 limits the full international number to 15 digits and excludes international and national prefixes. See the E.164 and international-format guide for the reusable structure and regional exceptions.
Common mistakes for this route
- Confusing the UK 00 exit prefix with digits that belong to the Indian destination.
- Adding a leading 0 before an Indian mobile number in international format.
Country code references
Related country-pair guides
Standards and country numbering-plan sources
- ITU-T E.164: The international public telecommunication numbering planInternational Telecommunication Union. Verified 2026-07-19.
- ITU-T E.123: Notation for national and international telephone numbersInternational Telecommunication Union. Verified 2026-07-19.
- The National Telephone Numbering PlanOfcom. Verified 2026-07-19.
- National numbering plan: United KingdomInternational Telecommunication Union. Verified 2026-07-19.
- National numbering plan: IndiaInternational Telecommunication Union. Verified 2026-07-19.
See our editorial and sourcing methodology.