My phone was working good but last 2 days data speed is very slow and showing 3G. Please, someone help me to solve this problem.
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Can you let us know if you're having an issue everywhere you go or it's only in one specific area? Would you have a different device you can test out your SIM card as well?
I am a frequent traveller, Its all over ontario
If you're travelling, are you sure you're in areas covered with LTE? Even if you're in an area designated LTE, your closest tower may not have LTE. Not all towers have all of the bands/frequencies I previously posted a link to a cellular tower site in your other thread here. Your phone could be accessing the network with the strongest signal.
There are a number of factors which could influence data speed, including signal strength, band/frequency, network congestion, etc.
Out of curiosity, did you try any of the secret codes to enable LTE on your phone or did you go straight to flashing the firmware?