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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Same issue with my J5 2016: initially I didn't manage to get speed higher than 4Mbps by wifi. Wifi router used is TPLink WR940N and ISP provides up to 300Mbps.
Both router and mobile comply with wifi standards 802.1b/g/n. 802.11n allows the highest speed, in the range 72Mbps - 600Mbps depending on NIC of each device, if channel bonding (two channels together for more band), MIMO (more antennas), etc. If you click on your current wifi connection on J5/2016 you will see that net speed of 72Mbps (phone built-in capabilities) .
On router side you must setup the highest power, use 40mhz (bonding). But check first situation of wifi signals from neighbourhood (interferences leading to lower speeds). Download a free app from MPlay like wifi analyzer. The app will show you what is freest channel for your net. Then I setup the router on that channel (chosen 20Mhz channel as 2.4Ghz band at my home is quite crowded and 40Mhz would't help), setup router on protocol 802.11n. Now I have constantly speeds >10Mbps...
door Catalin Gherghiceanu