Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[EX Q]: I frequently fly around Europe only with a hand luggage. Recently I bought a Kensington lock for my laptop which I usually take with me. The lock did not cause any problems at the airports in Edinburgh, Bremen, Athens, Copenhagen and Stansted. However, it almost got confiscated at the security gate at the Gdansk airport (Poland). It took me half an hour to convince the guard that I do not intend to harm anyone with that. I was told that although there are numerous hand luggage restrictions, the guard has a right to make a subjective decision whether or not to confiscate certain items.

My question is - did anyone hear about similar incidents with Kensington locks? Are there any specific rules or guidlines that I can refer to to defend my right to take the lock with me? Or maybe kensington locks should not be taken on board at all? And how do the restrictions differ around the globe?

[EX A]: Can I put Kensington lock in my hand luggage?

[EX Q]: I'd like to fly to the USA at the end of January and I was wondering if my phone (Elephone P7000) supports any of the frequency bands in the USA.

I am flying to Cary, North Carolina and my phone supports dual-sim with these frequencies:

GSM: 850/900/1800/1900 MHz
W-CDMA: 850/900/1900/2100 MHz
LTE: 800/1800/2100/2600 MHz

What network will I be able to use? Which sim-card is obtainable from Germany that is useable in USA? I'll be there for three days, so I won't cause much traffic.

[EX A]: Using mobile internet with a Elephone P7000 in the USA

[EX Q]: If I understand correctly, if an airline cancels a flight due to reasons beyond their control (a strike for example), passengers do not receive compensation under EU rules.

What are your rights if you have to reschedule your flight, due to reasons beyond your control (a strike for example, see below)? Can you, for example, reschedule free of charge?

Elaborated info:
The Greek seaman are currently on strike. This means there is no (public) transport from many of the smaller islands to the mainland. Due to this strike, some people I know were forced to reschedule their flight, as they couldn't get to the airport. Hopefully, the strike won't be extented another time, otherwise they would have to reschedule the flight again.

[EX A]:
What are your rights if you are forced to reschedule your flight?