Here are the answers to the sentences, completing them with the correct form of 'will':
- My phone isn't working very well. It won't be possible to text you later.
- I think my sister won't arrive late because she missed her train.
- People will use different new technology, not only their smartphones.
- Will people live on the moon in the future? I don't think so, do you?
Each sentence now uses 'will' (or 'won't' for the negative) correctly to express future actions or possibilities.