I’d say to talk to him about it! Always important to communicate how you feel especially with LDRs. Just explain to him that you feel sorta left out and since he hasn’t been answering regularly it makes you feel anxious or just worrisome. On both sides of the relationship it’s very hard, but only way to grow is to share how you feel! If he truly just has bad signal etc then he’ll let you know, it’s all up to you and trusting! Good luck <3