Let me make this a bit clearer 
If a guy wanted to change method of contact to a mobile device, they shouldn't just 'drop' me their number and expect a text or a call from me. I think that's a bit rude.
If the conversations between the guy and myself have gone on for a while and I'm keen on them, I would ask for their number (and I have done in the past.)
Even I would feel rude to just 'drop' my number in somebody's inbox.
Edit: Probably because I don't like being told to do things
"07123456789, text me" - why should I do as I'm told?!

If a guy wanted to change method of contact to a mobile device, they shouldn't just 'drop' me their number and expect a text or a call from me. I think that's a bit rude.
If the conversations between the guy and myself have gone on for a while and I'm keen on them, I would ask for their number (and I have done in the past.)
Even I would feel rude to just 'drop' my number in somebody's inbox.
Edit: Probably because I don't like being told to do things

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