# Add & edit test phones
Add test phones to your account to test your setups in the Sandbox environment.
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* You can add a maximum of **two** test phones to your account.
* The number of free test SMS messages you can send per account is limited to **10** per day with an overall maximum of **100** per month.
* Test messages are always free, however, if you are a self-serve customer, you need a positive account balance before you can send test messages.
* You will be charged for messages sent once the integration is promoted to production.
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## Add test phones
1. Navigate to *My Workspace -> SMS.*
2. Select *Manage Test Phones*.
3. Select the country this phone number is registered in and add the number of the test phone (**in international format**).
4. Click *Add*.
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To verify that the number you've entered is valid, an **OTP** will be sent to the number that you've entered.
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4. Enter the OTP and click *Submit PIN*.
5. If the PIN was entered correctly, the phone is added as a test phone to your account.
6. To remove a test phone, simply click the "X" icon next to it.
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If the test phone number has not been verified successfully, it will have a status of **Unverified**. You cannot use this number and have to remove it before trying to add it again.
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Test phones can also be set up as part of the [SMS setup wizard](https://guides.clickatell.com/sms-channel/getting-started/add-new-sms-setups-self-serve).
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## View & edit test phones
1. Go to *My Workspace -> SMS.*
2. Under *My SMS Numbers,* a table lists all your long numbers and short codes.
3. Select a number from this table to view its details, manage the connected API, and update the subscription linked to this number (*self-serve only*).
