# Device Metadata

Netmera SDK automatically collects key metadata from user devices to help you deliver smarter segmentation, real-time personalization, and meaningful analytics. These predefined system attributes serve as foundational building blocks in audience targeting, behavior tracking, and campaign optimization.

### Key Advantages

Device metadata plays a foundational role in how Netmera enables data-driven customer engagement. This information allows businesses to:

* **Deliver relevant content:** By understanding the user's device, operating system, and location, you can adjust your messaging strategy to match the technical context of the recipient.
* **Improve segmentation accuracy:** System-level data supports the creation of dynamic audiences based on attributes like OS version, app version, device region, or language.
* **Enhance analytical depth:** These fields help enrich dashboards and reporting by enabling breakdowns by platform, version, manufacturer, and more.
* **Support targeted debugging:** Understanding which environments are affected during technical issues (e.g., crashes on specific devices or OS versions) speeds up resolution time.

### Collected Fields

<table><thead><tr><th width="198.55133056640625">Field</th><th>Description</th></tr></thead><tbody><tr><td><code>appV</code></td><td>Application version (e.g., <code>4.3.3.0</code>)</td></tr><tr><td><code>mdl</code></td><td>Device model code (e.g., <code>T782H</code>)</td></tr><tr><td><code>lang</code></td><td>System language setting (<code>tr_TR</code>, <code>en_US</code>, etc.)</td></tr><tr><td><code>mnf</code></td><td>Device manufacturer (<code>TCL</code>, <code>Apple</code>, <code>Samsung</code>, etc.)</td></tr><tr><td><code>oc</code></td><td>Operator code (MCC + MNC as integer, e.g., <code>28502</code> = Operator TR)<br><strong>Note:</strong> Deprecated in iOS 15.4+</td></tr><tr><td><code>oper</code></td><td>Mobile operator name (e.g., <code>Operator TR</code>)<br><strong>Note:</strong> Deprecated in iOS 15.4+</td></tr><tr><td><code>osV</code></td><td>Operating system version (e.g., Android <code>11</code>, iOS <code>16.5</code>)</td></tr><tr><td><code>psV</code> (Android only)</td><td>Google Play Services version</td></tr><tr><td><code>rgn</code></td><td>Region/country code (<code>TR</code>, <code>US</code>, <code>DE</code>, etc.)</td></tr><tr><td><code>tzid</code></td><td>Time zone identifier (e.g., <code>Europe/Istanbul</code>)</td></tr></tbody></table>

#### About `oc` (operator code) and `oper` (operator name) Parameters

* **iOS**: These fields are collected **only on iOS versions 13 through 15.3**. As of iOS 15.4, Apple has deprecated access to this data due to privacy policy updates.
* **Android**: These fields are still supported and continue to be collected.

### Common Use Cases

Device metadata contributes to several critical use cases across marketing, analytics, and development teams:

#### 1. Version-Based Targeting

Use **App Version** and **Operating System Version** to:

* Identify users on outdated versions and prompt them to upgrade.
* Run A/B tests for new features based on OS or app version compatibility.

#### 2. Region and Language-Specific Campaigns

Use **Region Code** and **Device Language** to:

* Automatically localize message content according to the user’s language settings.
* Filter or exclude users in unsupported countries or regions.

#### 3. Telecom-Specific Analysis (Android Only)

Use **Operator Code** and **Operator Name** to:

* Analyze user distribution by mobile carrier.
* Correlate user engagement or churn with specific telecom providers.

> **Note:** These two fields are only available on Android and iOS versions 13 through 15.3. They are deprecated on iOS 15.4 and later due to Apple’s privacy restrictions.

#### 4. Device-Specific Performance Analysis

Use **Device Model** and **Device Manufacturer** to:

* Detect patterns in performance issues or crashes linked to specific devices.
* Adapt in-app experiences or campaign content based on device capabilities (e.g., optimize for low-end vs. high-end devices).