Suddenly plagued by calls on my mobile from a Bob call centre....

[minestrone]

Windows phone has a pretty decent block number facility as standard.

[Platypus]

Windows phone has a pretty decent block number facility as standard.

Yes, but unless the OP is a woman, they're unlikely to be using a Windows phone.

[Batcher]

The Mr Number app is great for blocking numbers. You don't have to put them in your contact list, just select to either hang up or force it to voicemail. I block 'numbers beginning with..." (for example 0843) so you don't have to list individual numbers. This is also good for spammers who use various numbers from call centres so if I don't know anyone in the area the call is from I just block the whole area code.

I also report spam texts to get the number blocked. I think a few of the providers do it but it certainly works with Three. When you get a spam text forward it to 7726 (SPAM on the number pad) and they send a text back asking for the number the text came from. They'll acknowledge your text and say they will block the number.

[d000hg]

Yes, but unless the OP is a woman, they're unlikely to be using a Windows phone.

Huh? Most of the women I know have/want iPhones.