yes 4g simcard have pros and con. from my experience using this sim for a years now. ytl company provide the best value for everyone. best to use in major city although when it comes to small town area everyone will have the connection issue in some area. but if you live near school area that have substation, connection issue wont be a problem. although sometimes the signal will suddenly gone and the sim cannot be used anymore. (happens to me often) it also will last till 2-3 days and sometimes even a week. try contacting their costumer service but havent got a replies.