Thanks for posting and welcome to the community.
I'm sorry you are having an issue with the broadband speeds.
Do you only notice these speeds on the iPhone?
Are other devices getting the correct speeds?
Have you tried a speed test through a wired connection to see what speeds you achieve?
Let us know how you get on
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Thanks for the update
Good to hear that your speed has improved!
Really appreciate you keeping us in the loop, let us know if we can help with anything else.
Catch you again soon,
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Sorry to hear this! Is this on your wireless connection? How is your Ethernet connection performing right now?
Please get back to us so we can continue to investigate.