# Locations & carriers

Mobile coverage spans **80+ countries** with at least one major carrier per country. Unlike residential, mobile is **carrier-first, geography-second** — `asn` (the carrier) is usually a bigger lever than `state` or `city`.

## Country (region)

Required. Lowercase ISO-3166 alpha-2.

```
helo_s1a2b3c4d5e-type-mob-region-us
```

Top markets by pool size: US, GB, DE, FR, JP, KR, BR, IN, ID, MX, CA, AU.

For the live list:

```bash
curl -H "Authorization: Bearer API_KEY" \
     https://api.helodata.com/v1/mobile/locations
```

## Carrier (ASN)

The mobile carrier you want to look like. Highly recommended on every mobile workload — see [ASN targeting](/products/overview-1/asn-targeting.md) for the full table and rationale.

```
helo_s1a2b3c4d5e-type-mob-region-us-asn-6167   # Verizon Wireless
helo_s1a2b3c4d5e-type-mob-region-jp-asn-2516   # KDDI
helo_s1a2b3c4d5e-type-mob-region-de-asn-3209   # Vodafone DE
```

## State / city (limited)

`state` and `city` are accepted but the live pool is usually small. Use only in tier-1 markets and only when geo precision is critical:

```
helo_s1a2b3c4d5e-type-mob-region-us-state-ca-city-la-asn-6167
```

If the combined filter has fewer than 10 live IPs, the gateway returns `522` + `X-Helodata-Insufficient-Pool: true`. Drop `city` first, then `state`.

## Major carriers per top market

| Country | Carrier                       | ASN   |
| ------- | ----------------------------- | ----- |
| US      | Verizon Wireless              | 6167  |
| US      | T-Mobile                      | 21928 |
| US      | AT\&T Mobility                | 20057 |
| GB      | EE / BT                       | 12576 |
| GB      | Vodafone UK                   | 12969 |
| DE      | Deutsche Telekom / Telekom DE | 3320  |
| DE      | Vodafone DE                   | 3209  |
| DE      | Telefónica O2 DE              | 6805  |
| FR      | Orange                        | 3215  |
| FR      | SFR                           | 15557 |
| JP      | KDDI                          | 2516  |
| JP      | NTT Docomo                    | 9605  |
| JP      | SoftBank                      | 17676 |
| KR      | SK Telecom                    | 9318  |
| BR      | Vivo / Telefónica BR          | 26599 |
| IN      | Reliance Jio                  | 55836 |
| IN      | Airtel                        | 24560 |

The ASNs listed are the public BGP ASNs; some carriers route mobile traffic through multiple ASNs. The API endpoint above lists every routable ASN per country.

## Why `state`/`city` is often empty on mobile

Mobile devices move. The geo data we have for a SIM is at best metro-area accuracy and at worst country-only (when the carrier doesn't expose finer info). When city granularity is needed, residential is the better tool.

## Coverage at a glance

| Coverage                         | Count |
| -------------------------------- | ----- |
| Countries with live IPs          | 80+   |
| Countries with multiple carriers | 30+   |
| Tier-1 markets (deep pools)      | 12    |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.helodata.com/products/overview-1/locations.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.