Does one of these three categories apply to you?
You purchased a premium subscription, and it hasn't expired yet, but you've lost premium functionality in the app.
You changed the phone number for your Salams account, and you've lost premium functionality in the app.
You want premium functionality on your Salams app but on a different device.
If one or more of these categories apply to you, then tap "Restore Purchases" on the Premium Upsell Screen to restore your premium membership to that device.
Go to Settings and tap on the Gold or Diamond subscription options, and the Premium Upsell Screen will automatically appear.