Accidental Border Roaming Prevention – Use Cases

Border Roaming Prevention Service regulates roaming registration in border regions by providing the served operator to prevent their subscribers from connecting to the border nation’s operator unintentionally near border areas. 

Subscribers are generally unaware of accidental roaming, and they are deeply frustrated by the high communication prices caused by accidental roaming. They may also experience service degradations if the interworking between the home network and the foreign network is poor. Accidental roaming is eliminated simply by treating the networks on the other side of the border as non-preferred networks and filtering roaming requests towards them from users whose previous connections originated from the home network. 

Use Case 1: Accidental Roaming

Accidental roaming occurs when a mobile device accidentally registers to an external mobile network, even though the subscriber is geographically within the home network area. The following conditions cause unintended roaming:

  • If the subscriber terminal’s final location is in the local network’s border region,
  • If the subscriber terminal’s most recent status reveals that the phone is still active, 
  • If the radio signals from adjacent networks are stronger than signals from home network,
  • If the mobile end devices are configured for “automatic network selection”.

In these situations,  there is a chance that the subscriber terminal will accidentally use the services of operators in nearby countries, and the accidental roaming prevention system works to stop this from happening within the configured boundaries. 

It is determined by joint examination of the subscriber location information, neighboring country border region monitoring and neighboring country border region detection whether or not the subscriber terminal could accidentally receive service from the operators of the neighboring countries.

Use Case 2: People living near Border Areas

Users who live near the border can be considered as a category or community of users to which special rules apply. For example, the same subscribers encountering accidental roaming cases frequently may mean those subscribers live near the border areas. By building such a logic within the service, the system intelligently distinguishes the users who live near the border regions and for those subscriber groups, selective blocking of surrounding cells that cause the inadvertent roaming may be used. 

Use Case 3: Genuine Roaming

Completely blocking the troublesome cells is not ideal because it could leave users without service when they execute genuine roaming in the neighboring nation. Timeout for prevention operation (i.e., disable prevention after a configured number of roaming attempts or after a configured time period) is used in order to overcome the genuine roaming issues.

The actual roamer that crosses the border is eventually connected because he has either crossed the border or made a certain number of roaming requests. RaaS Border Roaming Prevention Service inspects all Location Update (LU) requests from neighboring networks and decides if the LU request is accidental or genuine, depending on several criteria like the current cell id, for instance; if the current cell is a border cell or if there are multiple consecutive LU requests.

Use Case 4: Customers that move constantly between border zones

There exists a need for communication in roaming at a limited price at a limited price for customers that move constantly between border zones with their places of residence. [1]

Subscribers who move constantly between border zones can be considered as a category or community of users to which special rules apply. Those users may be detected by several criterias such as encountering genuine roaming cases near border areas frequently. By building such a logic within the service, the system intelligently distinguishes the users who move constantly between border zones and the home operator may offer border roaming tariffs to them, where the price is defined near to a local plan.

With the help of Defne RoamingSuite as a Service, mobile operators may stop their own users from unintentionally roaming on a foreign network while still inside their own nation or zone. Platform can successfully address issues with accidental or purposeful roaming as well as provides retention of roaming subscribers in the home network along the borders. By using the system, users and home network operators might potentially avoid claims, improve QoS, improve customer service, and decrease costs and losses. The following is offered; 

  • Roaming preventions based on both GSM and GPRS location updates in 2G/3G roaming.
  • Roaming preventions based on Diameter in 4G/LTE roaming
  • Identifying genuine & accidental roaming
  • Handling genuine & accidental roaming


To find out more about RaaS Border Roaming Prevention, you are welcome to contact us for further details. Check out RaaS just by clicking this link.



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