Wi-Fi is too weak?
The wireless of my phone is too slow
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The wireless of my phone is too slow
Sorry, but that is just not enough information in order for us to be able to assist you with a potential solution.
For example, some things that would be helpful:
Perhaps the steps in this article will help:
If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support
Wi-Fi is too weak?