If your Galaxy Tab A (10.5) drops data connections due to being near a network border, locking onto a specific network can help; however, roaming charges may apply.
: This is the preferred setting for most locations and should only be changed if experiencing service issues.
: This setting should only be selected if you experience service issues in locations that offer multiple network types and only LTE is needed.
: This setting should only be selected if you experience service issues in locations that offer multiple network types and only 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.