Iphone 5s not receiving twitter verification code?

I just linked my phone to my twitter so I have to type in a code that twitter sends to my phone in order to log in, but whenever i try to log in on my laptop, a code is sent but not received, What can I do? My twitter is logged in on my phone but I can't log in with my laptop. I know my phone is connected because i texted GO to the number twitter told me to text it to.

There are mainly two types of problems occurred, 1st you lost signal, 2nd the server of Twitter was busy, just wait for a while

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