Should I call him on viber?

My boyfriend and I talked yesterday on the phone. I asked him to call me when he gets home if he wanted to catch up cause he was driving. He didn't call me but my credit run out and so now I can't contact him unless he does. I have his contact on Viber. Should I drop him a message and let him know I can't call or text on the phone or let him call me first cause then he might feel pressured to contact me.
Should I call him on viber?
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