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Why my wifi network speed is slow on Samsung Galaxy J5?

My samsung galaxy J5 has a problem with wifi. My connection is 30 Mbps. But i am getting only 4 Mbps on the device(speedtested). All other wireless devices are working fine on 2.4ghz but only the J5 has this problem. I wiped cache partition and also reset the device couple of times. I have tried changing router channels and resetting​ the router also. My router is tplink archer c60 ac 1350Mbps dual band. The J5 only supports 2.4 ghz band.

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I also have the same problem with my tp-link archer C7. I too can only reach 4 Mbps with my J5 (2016). I don't know how to solve this problem, so I have installed my old router dlink dir-655 again. With that router I reach 37 Mbps. I have a 100/10 Mbps connection.

Could it be a tp-link archer problem? Anyway, I will use my tp-link archer C7 later, when I buy a new smartphone which will be an ac-smartphone.

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I think the problem is with J5. I get full speed if i turn on flight/airplane mode on. So it's definitely a phone issue.

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You are probably right. I used my old Samsung Galaxy S3 with the tp-link archer C7 a couple of days ago. No problems at all. Download at 33 Mbps! Thanks for the info about flight/airplane mode. I will try that.

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Yeah but using airplane mode is not a solution. So this doesn't solve the problem.

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You're right. It doesn't. Never found a solution for the J5(2016). Now I have a Samsung s7 edge. What a difference! On 2.4 GHz download at 95 Mbit/s. On 5 GHz download at 118 Mbit/s. Works great with my Archer c7. Recommend you to buy an ac phone instead of the J5(2016).

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The only "solution" to the slow wifi on J5(2016) was to change router. My J5(2016) hit 37 Mbit/s with the Dlink DIR-655 as I stated last year. If any of you guys find a real solution out there, please post it here! Personally I think it is a hardware component problem in the J5(2016). It is a budget smartphone.

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