[patcito]

but cellphones may get half of the message only, as it is limited to 140 chars.

[TweedHeads]

No, the message is still limited to 140 chars, for cellphones or browsers, the link handling is done behind doors.

[prodigal_erik]

So where does the phone get the URL, another message?

[TweedHeads]

Phones don't get the url, just the LINK placeholder, you can not navigate on a cellphone.

Now, smartphones, they use browsers, browsers can read html, then they get the url under the LINK placeholder.