How did people communicate during the First World War?

Question or Hint Answer or Word

What punishment could you receive during the First World War if you hurt or killed a messenger pigeon? £100 fine or 6 month prison sentence (wrong answers: Litter picking, 6 press ups, 40 years in prison )
How much did it cost to send a telegram during the First World War? 6d (£3.60) (wrong answers: £5, £100, They were free)
What type of telephones may have been used 100 years ago? candlestick telephone (wrong answers: mobile phone, walkie talkie, iPad)
What was the name of the famous messenger pigeon who saved 200 lives in the First World War? Cher Ami (wrong answers: Charles, Tweet Tweet, Chez Lounge)