---
title: "Troubleshoot SMS issues"
slug: "sens-troubleshoot-sms"
updated: 2026-09-17T09:18:10Z
published: 2026-09-17T09:18:10Z
canonical: "guide.ncloud-docs.com/sens-troubleshoot-sms"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshoot SMS issues

Available in Classic and VPC

You might run into the following problems when using Simple & Easy Notification Service. Find out causes and possible solutions.

## reserveTime setting errors

When the scheduled message's reserveTime extends beyond approximately 6 months from now, an error occurs.

#### Cause

The delivery date of scheduled messages can be set within 180 days only. The scheduled delivery is not supported after that period.

#### Solution

As described in Cause, this is a normal operation. Set the delivery date of scheduled messages within 180 days.

## Unable to unsubscribe from 080 Block Call Service

I can't unsubscribe from 080 Block Call Service.

#### Cause

Unsubscribing from 080 Block Call Service changes the status to "STOPPED." After your unsubscription request is received, final deletion may take 3 to 4 business days from the "STOPPED" status due to the settlement process of the relay company.

#### Solution

As described in Cause, this is a normal operation. Wait for a moment until the unsubscription is completed.

## Sending limit increase

The sending limit is too low. I want to increase the sending limit for domestic and international SMS (including LMS and MMS).

#### Cause

The default sending limit is as follows. If you need to send SMS beyond the default sending limit, you must request Customer Support.

- Domestic (Republic of Korea) SMS: 500 per day and 10,000 per month
- International SMS: 500 per day and 500 per month

#### Solution

To increase a sending limit, follow these steps:

1. Log in with the account whose sending limit you want to increase.
2. Click **Customer Support** > **Contact us**.
3. Request the limit increase including the following information:
  - Service ID
  - Reasons for increasing the limit
  - Base data
  - Services to use (web URL and App Store URL)

              Note

              

Service ID can be viewed in the project menu.

## Error 3009

When I sent an MMS, I received Error 3009.

#### Cause

Error 3009 occurs when the message type has an error.

#### Solution

Check the format of the file attached to the MMS.

- Whether the file extension is JPG or JPEG
- Up to 300 Kbyte per original file
- File name up to 40 characters
- No space allowed in the file name
- Resolution up to 1500 * 1440

## Error 3014 and "other" error messages

I received Error 3014. I received Error 3014, but the message "other" is displayed only.

#### Cause

Error 3014 and other errors occur when the message is not processed by the mobile carrier, although it was sent normally.

#### Solution

To identify the exact causes, the owner of the device must contact the mobile carrier directly. This falls under personal information, so NAVER Cloud Platform, a third party, cannot identify causes that are not processed by the mobile carrier.

## Error 3015 and error message: "No delivery path"

I received Error 3015. I received the error message "No delivery path."

#### Cause

This error occurs when the number is invalid or does not exist. This error occurs when a country code or mobile phone number is entered incorrectly.

#### Solution

Check if the calling number is entered correctly.

## Errors 3018

I sent an SMS message and received Error 3018.

#### Cause

Error 3018 occurs due to the caller ID spoofing protection service.

#### Solution

Contact your mobile carrier to request to unsubscribe from the caller ID spoofing protection service. You must unsubscribe from the service in person. It may take 3 to 4 business days to be processed after your unsubscription request.

## Replacement of specific characters with special characters in messages

When I send an SMS message, specific characters are replaced with the character "?."

#### Cause

When you send an SMS message, it is encoded in EUC-KR and sent directly by the mobile carrier. A character that is not encoded in EUC-KR is replaced with "?" and sent.

#### Solution

As described in Cause, this is a normal operation.

## Change the registered calling number

I want to change the registered calling number.

#### Cause

The calling number change is not supported.

#### Solution

Apply for a new calling number by referring to the [calling number registration guide](/docs/en/sens-callingno).

              Note

              

If you're still having trouble finding what you need, click on the feedback icon and send us your thoughts and requests. We'll use your feedback to improve this guide.