I want to get into speedrunning but don't have a fancy setup so i was thinking of using a phone cam instead till i get the real deal,Any suggestions?(Btw i own switch,3ds,wii,and wii u)
Most games allow it, some only allow it for times below a certain point. Check in with the specific game's forums if its allowed. Some games dont even require a phone cam if your time is below a certain amount and instead is fine with no game footage.
Edit: about the specific consoles, I'm pretty sure every single 3ds game or 99.9% of 3ds games allow phone cam as 3ds capture devices are notorious for being difficult to get, as with the switch, wii, and wii u, i think 90% of games allow it but there might be some that dont allow it if your time is too good. Check with whatever game you are planning on speedrunning.
As long as your video complies with all of the rules laid out for the games you want to submit runs for, it is fine however it's recorded.
You are allowed to use any recorder (even a phone cam), as long as the game were clearly seen.
For capture card suggestion, check out this thread: https://www.speedrun.com/streaming_recording_equipment/thread/qlnmy