With 4 mobile proxies, you should carefully consider the number of accounts on each proxy, because no matter how strong the mobile proxy is, there is still a risk of abnormal IP jumping. It is best to only run 2-3 accounts on each proxy, just enough to avoid duplicate traces and keep the account safe. With 4 proxies in total, a limit of about 8-12 accounts is reasonable. Don't be greedy to cram too many accounts on 1 proxy, because continuous IP jumping is the main cause of checkpoints and loss of accounts for unknown reasons. Always check the stability of the IP before scaling, avoid the situation of getting stuck on checkpoints all because of a faulty proxy.