[irrational]

At home we have a landline and I'll often call people on that. It doesn't have any way to receive text messages. It seems to me like there needs to be a universal way to indicate whether a given phone number has the ability to receive texts or not. I'm now wondering how many people I've called, who didn't pick up, tried to text me back at that number and thought I was ignoring their texts.

[kjakm]

In the UK you can (sort of) text a landline. It's been a while since I've done it but I think the person receives it as a call and then an automated voice reads the message.

[rahoulb]

Plus for the most part you can distinguish between mobile (07) and non-mobile (everything else) numbers (although VOIP numbers mess with that a bit).