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

[EX Q]: I have made Sihanoukville, Cambodia, my travel-around-Asia operations-base for some time now. Now I need to travel to Europe and back... To save some cash on tickets, I will be going to the Thai border by bus, get a visa and fly with Finnair, then return back to Bangkok, catching a bus back to Sihanoukville.

It suddenly hit me that when returning I will be landing in Bangkok and it's my final destination. And I might be asked by Finnair when boarding for proof of onward travel even if I started my journey with them in Thailand. And usually bus tickets do not 'cut it'.

I have Lithuanian passport. 

Do I need to get proof of onward travel for my return flight to Thailand, even though I am using the same company (Finnair) to do the round trip to my original destination?

[EX A]: Going from Cambodia to Europe via Thailand and back. Do I need proof of onward travel for the return flight?

[EX Q]: For a particular hotel I booked Expedia's Check-in policies section states the following:


  Check-in time starts at 4 PM
  
  If a late check-in is planned, contact this property directly for their late check-in policy.


My question is...  what constitutes a late check-in? My flight is scheduled to arrive at the airport at 8:34pm.

[EX A]: What constitutes a late check-in for a hotel and should I inform them about my late arrival?

[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