I have a Samsung mobile phone. How do I turn off the roaming?

these are apparently the settings
https://www.fixya.com/support/t26922303-apn_settings_safetynet_wireless_lifeline

APN & data settings

1. From any Home screen, tap Apps.
2. Tap Settings > More > Cellular networks.
3. Tap Access Point Names.
4. If available, tap the T-Mobile US APN.
   • If not available, tap the New APN icon.
   • To reset your APN settings, tap the Menu icon with three dots, then tap Reset to default.
5. Verify and update the following settings for the Data APN:
   • Name: T-Mobile US
   • APN: fast.t-mobile.com
   • Proxy: <Not set>
   • Port: <Not set>
   • Username: <Not set>
   • Password: <Not set>
   • Server: <Not set>
   • MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
   • MMS proxy: <Not set>
   • MMS port: <Not set>
   • MMS protocol: WAP 2.0
   • MCC: 310
   • MNC: 260
   • Authentication type:<Not set>
   • APN type: default,supl,mms
   • APN protocol: IPv6
   • APN roaming protocol: IPv4
   • Enable/disable APN: <greyed out unless there are multiple APN's>
   • Bearer: Unspecified
   • MVNO type: None
   • MVNO value: <Not set>
6. Tap the Menu icon with three dots, then tap Save.
7. Tap the desired APN profile you want to use. The bullet point fills with color next to the APN profile.

Manual network selection

The device detects and registers on wireless networks inside T-Mobile's calling area, but roaming networks are usually restricted to T-Mobile SIM cards. You can manually select a network only in areas where T-Mobile does not own GSM spectrum.

1. From any Home screen, tap Apps.
2. Tap Settings > More > Cellular networks.
3. Tap Network operators.
4. Wait while the device populates a list of available networks.
5. Tap the desired network you wish to register on.

Switch 2G / 4G

1. From any Home screen, tap Apps.
2. Tap Settings > More > Cellular networks.
3. Tap Preferred network types.
4. Choose from the following options:
   • LTE/WCDMA/GSM (Auto mode)
   • WCDMA/GSM
   • GSM only

Turn on / off airplane mode

Airplane mode turns off wireless connections. This allows app and menu use, but prevents voice or Internet use.

1. From any screen, swipe down from the top of the screen.
2. Tap the down icon (v), the tap Airplane to turn on or off.

Turn on / off data roaming

1. From any Home screen, tap Apps.
2. Tap Settings > More > Cellular networks.
3. Tap to turn Data Roaming on or off.

Turn on / off mobile data

1. From any Home screen, tap Apps > Settings > Data usage.
2. Tap to turn Cellular data on or off.

From - https://support.t-mobile.com/docs/DOC-28547


this is the instructions for samsung on how to change settings
https://www.t-mobile.com/support/devices/android/samsung-galaxy-j7/network-apn-and-volte-samsung-galaxy-j7#steps1

To turn off roaming go to your settings app, wireless & networks, mobile networks, data roaming, and turn data roaming off. How to turn data roaming and data services on off on my Samsung Galaxy...

Go into settings from Home screen. Under wireless & Networks find More... and press, then Mobile networks. switch on Data roaming by ticking the box. May need to Data enabled tick as well up the top.

HI if you want to unlock your samsung c3510 mobile from network lock then free network unlock code are not available for your mobile model so better purchase code from reliable paid providers like Mobile-Unlocker.com for affordable cost .They are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone ...

Hi Cyndi,
I have this site for you on how to do disable roaming. It includes image on how to do it. Hope it helps.
How to turn data services and data roaming on off on my Samsung Galaxy...

If you pay Rogers for service, they owe you help.
You are worth that, right?
A

1. On the Home screen, click the Manage Connections icon.
2. Click Mobile Network Options.
3. Perform one of the following actions:
   • To turn on or turn off data service, change the Data Services field.
   • To turn on or turn off data service when roaming, change the While Roaming field.
   • To receive a prompt when roaming that allows you to turn on or turn off data service, change the While Roaming field to Prompt.
4. Press the Menu key.
5. Click Save.

You can't do this manually, its a automatically procedure whenever you go outside from your native state a R will be displayed on your screen. Its a roaming symbol.

• I recommend you to go to the Authorized Samsung Service Center to get your phone
• OR
• It would be better if you buy a new ONE (a brand new mobile phone) as the cost of repairing the touch screen is really high.

you may wont to contact cricket and get verification on your service area........the roaming triangle should only apply to the device main screen when the towers being used have a roaming contract with the provider. you may very well be roaming but not from your device.....you may be roaming in the cellular network though.....contact cricket from another device for troubleshooting options at (866) 274-2538

GOOD LUCK !!!!!!!!