Wifi signal not detected by tablet

[copsline]

I have a phantom 3 4k. I don't find the wifi signal of my aircraft on a smartphone or a tablet. I can fly but only without being on DJI GO.
The diod on the radio remote control is always red.
I already try to reset Wifi Password on Remote.
Do you have a idea to fix the problem ?
Thank you

 

[Marnat3]

If you have a cell phone in your pocket or close by it may interfere with signal to the tablet or phone you are using to fly.
Happened to me. Put my cell in airplane mode while flying and no issue with tablet connection. Hope this helps.

 

[copsline]

I wasn't aware of that, but there is a big semaphore near me. It probably interfere with the signal because in other places it works perfectly. Thanks you for your answer.