Is there any danger in hotswapping SIMs? Basically, > turn

You get weird looks because you're swapping SIMs.

You get weird looks because you were too stupid to get a dual SIM phone.

The only danger is that you can't know how exactly the communication processor handles airplane mode. Theoretically it should completely disable the RTOS tasks implementing the network stack, free memory, etc. However I can imagine some implementations that do not consider that SIM can be ever swapped and may hold some values from old SIM in memory (MCC, MNC). This may affect what networks you phone will connect to. There also may be some watchdog looking from signals from SIM socket that restarts the CP or entire phone if SIM is changed.
If it worked for you for years with your current phone, then there's problably no danger to that phone. But this is entirely implementation-dependent and not mandated by any specification.

>>60913791
This. Also OP, is it an Android or iPhone? If it's a chink Android there's likely a bigger risk but if its Samsung, Google, Apple, etc. then it's likely fine.
>inb4 Windows Phone

Are you a mujahideen or something

>>60913641
Why do you do this?
I legit have no idea.

>>60914347
Not OP. Usually if you're traveling between countries (example: truck driver in Europe) it's cheaper to use a local SIM than deal with roaming costs. This only applies to non-EU carriers since EU carriers no longer have extra roaming fees.

>>60913641
Aile is not a cyborg