I can't send a text to a particular number

[Foxy3]

Just got the phone , imported numbers manually but unable to send a text to 1 certain number !

[Uliwooly]

is it a SMS or MMS or both? do you have the correct number? has that user blocked you? 

[Alexander1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

Is it a ordinary mobile phone number you are trying to send to? 

Have you tried to delete the contact and add it again?