> For the complete documentation index, see [llms.txt](https://docs.hackle.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hackle.io/en/development-guide/android/user-identifier/android-user-info-crm.md).
# CRM Properties
CRM Properties are stored securely only on the Hackle server and cannot be directly queried through the SDK.
{% hint style="danger" %}
CRM Properties are managed separately and are not deleted or reset when `resetUser()` is called or when `clearAll` is called in `updateUserProperties`.
If a user unregisters or similar actions occur, you must separately call the provided function to delete the information.
{% endhint %}
## Phone Number Collection
{% hint style="info" %}
This feature is supported in Android SDK 2.52.0 and above.
{% endhint %}
{% hint style="success" %}
Recommendation for Kakao / Text Messages
By mapping the User Identifier to a phone number using this feature, you can use Kakao / Text Messages via Hackle more smoothly.
{% endhint %}
#### setPhoneNumber
Registers the user's phone number.
The phone number is only saved if it is in the correct E.164 format. If no country code is specified, South Korea (+82) is used as the default.
If the user already has a saved phone number, calling this function replaces the existing phone number with the new value.
```kotlin
val myPhoneNumber = '+821012341234';
Hackle.app.setPhoneNumber(myPhoneNumber);
```
#### unsetPhoneNumber
Deletes the phone number registered for the user.
```kotlin
hackleApp.unsetPhoneNumber();
```
## CRM Marketing Subscription Consent
{% hint style="info" %}
This feature is supported in Android SDK 2.55.0 and above.
For details on subscription consent status, refer to the [CRM Marketing Subscription Consent Management](/en/development-guide/sdk/user-identifier/crm-subscription.md) documentation.
{% endhint %}
### Subscription Consent Properties
You can consent to or reject subscriptions by message purpose.
Use `HackleSubscriptionOperations.Builder` to configure the consent status for the desired properties, then finalize the update using a method like `updatePushSubscriptions()`.
You can update the consent status per message channel.
```kotlin
import io.hackle.sdk.common.subscription.HackleSubscriptionOperations
import io.hackle.sdk.common.subscription.HackleSubscriptionStatus
val subscriptions = HackleSubscriptionOperations.builder()
.marketing(HackleSubscriptionStatus.SUBSCRIBED)
.information(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updatePushSubscriptions(subscriptions)
```
#### Promotional Messages
Sets the promotional message subscription consent property.
```kotlin
import io.hackle.sdk.common.subscription.HackleSubscriptionOperations
import io.hackle.sdk.common.subscription.HackleSubscriptionStatus
val subscriptions = HackleSubscriptionOperations.builder()
.marketing(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updatePushSubscriptions(subscriptions)
```
#### Informational Messages
Sets the informational message subscription consent property.
```kotlin
import io.hackle.sdk.common.subscription.HackleSubscriptionOperations
import io.hackle.sdk.common.subscription.HackleSubscriptionStatus
val subscriptions = HackleSubscriptionOperations.builder()
.information(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updatePushSubscriptions(subscriptions)
```
#### HackleSubscriptionStatus
HackleSubscriptionStatus
Description
UNKNOWN
Subscription Consent has not been given or denied (default)
SUBSCRIPTION
Explicitly opted in to receive messages
UNSUBSCRIPTION
Explicitly opted out of receiving messages
### Update Push Subscription Consent Status
Updates the user's Push Message subscription consent status.
```kotlin
val subscriptions = HackleSubscriptionOperations.builder()
.marketing(HackleSubscriptionStatus.SUBSCRIBED)
.information(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updatePushSubscriptions(subscriptions)
```
### Update Kakao Message Subscription Consent Status
Updates the user's Kakao Message subscription consent status.
```kotlin
val subscriptions = HackleSubscriptionOperations.builder()
.marketing(HackleSubscriptionStatus.SUBSCRIBED)
.information(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updateKakaoSubscriptions(subscriptions)
```
### Update Text Message Subscription Consent Status
Updates the user's Text Message subscription consent status.
```kotlin
val subscriptions = HackleSubscriptionOperations.builder()
.marketing(HackleSubscriptionStatus.SUBSCRIBED)
.information(HackleSubscriptionStatus.SUBSCRIBED)
.build()
hackle.app.updateSmsSubscriptions(subscriptions)
```
---
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