If your Galaxy J3 V drops calls due to being near a network border, locking onto a specific network can help; however, roaming charges may apply.
Tap the appropriate setting:
Global
: This is the preferred setting for most locations.
LTE/CDMA
: This setting should only be selected if experiencing service issues in locations that offer multiple network types and only LTE/CDMA is needed.
LTE/GSM/UMTS
: This setting should only be selected if experiencing service issues in locations that offer multiple network types and only LTE/GSM/UMTS is needed.
The preferred international carrier is automatically selected.
You can manually select an alternate carrier but it may require as many as 6 registration attempts with that carrier before successful registration.