Please note that as per our user guides, you are required to make sure the SIM in your Petrek device needs to be topped up once every 12 months. If it is not topped up within 13 months after the first or last top up it will be deactivated by One NZ. When this happens, the device is best to be sent back to us for a SIM replacement.  You can purchase a new SIM + Setup pack here.  After the first year of usage, there will also be a Google Map app fee which was announced in 2020. Further information can be found at the provided link. If your area has limited reception to Spark, Skinny, or 2degrees, please inform us when placing your order so we can provide the preferred SIM cards. Please note that other carriers may incur costs ranging from $5-10 per month, depending on their available plans. We typically activate the SIM cards on the smallest data packs, typically 100MB per month. Spark for example, costs $5 per 4 weeks to run on Petrek units. The SIM card is specific to the Petrek device, so be careful not to confuse it with the one in your phone. It is not necessary to use the same SIM provider for your phone. Users are not advised to replace their own SIM cards due to the IP67 waterproof rating of the device. The seals must be replaced and torqued after each removal to minimize water damage. We suggest utilizing One NZ Pay & Go plans for all our GPS-based trackers to ensure cost effectiveness for users, provided that there is ample reception available.