Straight talk iphone won't connect to Wi-Fi unless its really close to router?

My iphone won't connect to Wi-Fi unless its really close to the source of it or the router. It is an iphone 4 on straight talk. And the internet connection without Wi-Fi is super slow. It wasn't always like this, just recently. Any help?

I also face a silimar issue.
I'd request you to please resetup your Wi-Fi connection in your phone with your router.
Also, just restart your phone after that.
It works as range booster.
Cheers!

Reset your router and modem. Then turn your phone off and back on. This should solve the problem you are having.

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