The main purpose of the study was to determine the effect of SMS (Short Message Service) on language proficiency of the Public High School Students in Misamis Oriental. Likewise, it sought to answer the following aspects of the main problem as sms language is affected by the profile of the respondents and their language proficiency skills. Analysis also includes the implications of the results toward a significant study on both sms (short message service) and language proficiency. The researcher made use of the descriptive-survey method of research. There are three(3) sets of research instruments used for the purpose of gathering data and information needed for the study. Student’s Questionnaire is composed of four(4) parts. Part I - inquires specific information such as age, gender, length of ownership of the cell phone, amount of spent in texting and type of message sent; Part II - SMS test which indicates a 25-list of words, phrase and sentences written in a text or sms which requires the students to write the correct spelling of the words, phrases and sentences; Part III- Diagnostic Test consists of 50 items for Grammar, Vocabulary and Spelling; Part IV- Three Composition Writing which is to assess student’s grammar, vocabulary and spelling. The result of the students’ proficiency skills in terms of grammar, spelling and vocabulary that is based on the transcription of SMS is significantly better compared to the diagnostic test given to the respondents. Anchored on the findings, teachers should implement extra reading reports to improve vocabulary, grammar and spelling.
