I just bought my spark 2 weeks ago but, now I cannot connect my app cause the RC doesn’t emit a WiFi network so I just use my spark trough my iPhone
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Actually the symptom indicates your mobile cannot recognize two types of WiFi frequencies viz; 2.4Ghz and 5.8Ghz .
Please check your mobile user manual for these information.
The SPARK Rc works on these wifi bands.

I used a couple of times with my mobile but now it just doesn’t show the WiFi network so that I connect it to the app and then link it to the aircraft

Try to use the QR on the back of the remote. If this does not work, contact DJI support directly and open up a case with them.

You can also try OTG cable for connection.

Fly Safe.
Alex.

Sorry for the trouble. May I know what exact iPhone model and IOS version you are using? Try  to put your phone on an airplane mode and then check the WiFi again of the remote controller. Make sure that your phone and remote controller is fully charge. Once you were able to find the Wifi of your remote controller, kindly follow the video tutorial below on how to properly link your remote to your aircraft.

The links not working!

iPhone 7, versión 11.4.1
Thank u all for this