roaming service when travelling abroad

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hello, mylotters! are you planning to have a trip abroad soon? or are you living/working abroad? do you keep a roaming sim card and use a roaming service each time? i have tried using roaming service before but i gave them up because i need to make sure that i'm using two mobile phones. all right, i've got a dual-simcard phone but it's a hassle to shift from one to another and then back. the roaming service i used are for sending and receiving sms only. if i travel from here to my homecountry, i use roaming service only for incoming sms but seldom for sending replies. i never answer calls because they are costly, too. how about you? are you still using any roaming service when you travel abroad? is it convenient and affordable? do you use a separate phone for it? thanks.