Hello @MothMan337 and welcome to our o2 community :-)
using a device that accesses the mobilke network is prone to a lot of possible circumstances that may affect the speed and latency of the connection. This may double if you connect to this router via a wifi network.
Looking a the screenshot that you provided it seems that a last one server seems quite stable with the avarage ping time so it seems that the reason why other srevers may have ping spikes not necessarily lies in the used mobile connection itself.
How does it look like now? Does it still look the same? What effect does it have on you using the internet? Are there sevices that do not work as expected?
Regards,
Lars