Random text messages to unknown numbers?

My iphone has been off all day, from about 7am to 4pm and i turned it back on, i looked in my text messages and i see a text that "I" sent to some number i've never even seen before. There was no answer from that number but its just the fact that my phone has been off all day and plus i have a password lock on it so its impossible that i or anyone else in my house did it, is this some kind of virus? Also to mention i've been getting repeated calls over and over for the past few weeks from different numbers and different states all over the country

Call 611 from your phone, tell your service provider. Someone has spammed you.

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