Switching to 3G helped. But why then LTE Cat7? I myself am a fool, but consider my experience - this is not a magic wand and will not suit everyone. Pros: Excellent workmanship The most simple and understandable admin panel in 2022 Some cons: In the conditions of overloaded towers 15 km from Hong Kong, nowhere did I give out more than a phone or a provider ZTE MF920 with both beeline and megaphone sim. At the same time, Wi-Fi gives weaker. If the connection is lost (the BS is overloaded? ), it does not restore the connection and requires a reboot (or it takes a very long time to restore, while on the provider's ZTE at Megafon, everything usually rises in a minute).
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