Giving a girl your number?

Guy #1 gave me his number, I call him, he returns my call but when I answer I can hear no one respond

Why are guys happily giving me their numbers(I know talk to these guys for a while) Yet not responding when I call or text?

Guy#2 he happily gave me his number said he would help me workout, I don't know if he is going to do me the same way, but I have experienced this before lots of times
Giving a girl your number?
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