Official NTT DOCOMO Network
How to Set Up Your DOCOMO SIM – CTS Japan
Complete step-by-step setup guide for CTS Japan DOCOMO SIM cards. Identify your SIM type and device below to view the exact setup instructions and illustrated screenshots.
Step 1: Which SIM are you using?
Step 2: Select your phone
SIM card inserted into tray 1
Connected to Wi-Fi
Old SIM profiles deleted
iPhone Setup Steps
5 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into your iPhone. Signal bars will appear at the top screen.
2
Delete Old Profiles (if any)
Settings
›
General
›
VPN & Device Management
Delete any old SIM profiles to avoid network conflicts.
3
Download APN Profile
Connect to Wi-Fi and tap the button below in Safari (tap Allow when prompted):
Download Docomo APN Profile (mvno.net)
4
Install Profile
Settings
›
Profile Downloaded
›
Install
Select mvno.net (PCLD) profile. Tap Install at top-right and enter your passcode to confirm.
5
Turn Off Wi-Fi & Connect
Settings
›
Cellular
›
Cellular Data: ON
Turn Wi-Fi OFF. Wait 1–2 minutes for 4G/5G to appear.
Setup complete! Connected to Docomo network.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app
browsers like Facebook or Line). Also verify that old profiles from previous carriers have been removed
under Settings › General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au,
docomo, or international carrier). Please contact your original carrier to request an official SIM
unlock.
How do I check my remaining high-speed data balance? +
Your monthly high-speed data quota renews on the 1st of each calendar month. For
data usage inquiries or plan upgrades, please contact our customer support team.
Android Setup Steps
4 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into SIM slot 1. The mobile antenna icon will appear.
2
Open Access Point Names (APN)
Settings
›
Mobile Network
›
Access Point Names
3
Add New APN Profile
Tap + (Add) or menu (⋮) → New APN and enter parameters below:
Name
CTS
APN
mvno.net
Username
csim
Password
csim
Authentication Type
PAP or CHAP
APN Type
default,supl,ia
4
Save, Select "CTS" & Restart
Tap Menu (⋮)
›
Save
›
Select "CTS"
Turn Wi-Fi OFF, enable Mobile Data, and restart phone. 4G/5G connects in 1–2 minutes.
Connected! Your Docomo Data plan is ready to use.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app
browsers like Facebook or Line). Also verify that old profiles from previous carriers have been removed
under Settings › General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au,
docomo, or international carrier). Please contact your original carrier to request an official SIM
unlock.
How do I check my remaining high-speed data balance? +
Your monthly high-speed data quota renews on the 1st of each calendar month. For
data usage inquiries or plan upgrades, please contact our customer support team.
iPhone Setup Steps
5 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into your iPhone. Signal bars will appear at the top screen.
2
Delete Old Profiles (if any)
Settings
›
General
›
VPN & Device Management
Delete any old SIM profiles to avoid network conflicts.
3
Download APN Profile
Connect to Wi-Fi and tap the button below in Safari (tap Allow when prompted):
Download Docomo APN Profile
4
Install Profile
Settings
›
Profile Downloaded
›
Install
Select CTS profile. Tap Install at top-right and enter your passcode to confirm.
5
Turn Off Wi-Fi & Connect
Settings
›
Cellular
›
Cellular Data: ON
Turn Wi-Fi OFF. Wait 1–2 minutes for 4G/5G to appear.
Setup complete! Connected to Docomo network.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app
browsers like Facebook or Line). Also verify that old profiles from previous carriers have been removed
under Settings › General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au,
docomo, or international carrier). Please contact your original carrier to request an official SIM
unlock.
How do I check my annual plan status or data quota? +
Your high-speed data quota renews each calendar month based on your annual
subscription package. For plan extensions, usage inquiries, or contract renewals, message our customer
support team anytime.
Android Setup Steps
4 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into SIM slot 1. The mobile antenna icon will appear.
2
Open Access Point Names (APN)
Settings
›
Mobile Network
›
Access Point Names
3
Add New APN Profile
Tap + (Add) or menu (⋮) → New APN and enter parameters below:
Name
CTS
APN
cmlink.com
Username
cmjp@cmlink.com
Password
cmlink
Authentication Type
PAP or CHAP
APN Type
default,supl,ia
4
Save, Select "CTS" & Restart
Tap Menu (⋮)
›
Save
›
Select "CTS"
Turn Wi-Fi OFF, enable Mobile Data, and restart phone. 4G/5G connects in 1–2 minutes.
Connected! Your Docomo Voice plan is ready to use.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app
browsers like Facebook or Line). Also verify that old profiles from previous carriers have been removed
under Settings › General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au,
docomo, or international carrier). Please contact your original carrier to request an official SIM
unlock.
How do I check my annual plan status or data quota? +
Your high-speed data quota renews each calendar month based on your annual
subscription package. For plan extensions, usage inquiries, or contract renewals, message our customer
support team anytime.
iPhone Setup Steps
5 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into your iPhone. Signal bars will appear at the top screen.
2
Delete Old Profiles (if any)
Settings
›
General
›
VPN & Device Management
Delete any old SIM profiles to avoid network conflicts.
3
Download APN Profile
Connect to Wi-Fi and tap the button below in Safari (tap Allow when prompted):
Download Docomo APN Profile
4
Install Profile
Settings
›
Profile Downloaded
›
Install
Tap Install at top-right and enter your passcode to confirm.
5
Turn Off Wi-Fi & Connect
Settings
›
Cellular
›
Cellular Data: ON
Turn Wi-Fi OFF. Wait 1–2 minutes for 4G/5G to appear.
Setup complete! Connected to Docomo network.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app browsers like Facebook
or Line). Also verify that old profiles from previous carriers have been removed under Settings ›
General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au, docomo, or international
carrier). Please contact your original carrier to request an official SIM unlock.
When does the 100GB monthly high-speed quota renew? +
Your 100GB data allowance automatically refreshes on the 1st of each calendar month. For plan renewal or
checking data balances, message our customer support team anytime.
Android Setup Steps
4 Steps1
Insert SIM & Check Signal
Insert the Docomo SIM card into SIM slot 1. The mobile antenna icon will appear.
2
Open Access Point Names (APN)
Settings
›
Mobile Network
›
Access Point Names
3
Add New APN Profile
Tap + (Add) or menu (⋮) → New APN and enter parameters below:
Name
CTS
APN
apn-tco.jp
Username
apntco
Password
apntco
Authentication Type
PAP or CHAP
APN Type
default,supl,ia
4
Save, Select "CTS" & Restart
Tap Menu (⋮)
›
Save
›
Select "CTS"
Turn Wi-Fi OFF, enable Mobile Data, and restart phone. 4G/5G connects in 1–2 minutes.
Connected! Your 100GB plan is ready to use.
Frequently Asked Questions
Signal bars show, but no 4G/5G icon or data connection? +
1. Ensure Wi-Fi is turned completely OFF.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
2. On Android, verify that the radio button next to "CTS" in APN settings is selected.
3. Turn Airplane Mode ON for 10 seconds, then turn it OFF, or restart your phone.
iPhone: Profile will not download or shows an error? +
Confirm you are accessing the download link from Apple Safari (not in-app browsers like Facebook
or Line). Also verify that old profiles from previous carriers have been removed under Settings ›
General › VPN & Device Management.
Device indicates "SIM Not Supported" or "SIM Locked"? +
This indicates your device is locked to your previous carrier (SoftBank, au, docomo, or international
carrier). Please contact your original carrier to request an official SIM unlock.
When does the 100GB monthly high-speed quota renew? +
Your 100GB data allowance automatically refreshes on the 1st of each calendar month. For plan renewal or
checking data balances, message our customer support team anytime.
Need Assistance with Setup?
Our multilingual customer care team is available to assist you in English, Vietnamese, and Japanese.
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