message send/receive issues

For about the past two weeks my iphone 6s and my sons 6 plus have had issues with sending/receiving messages within group texts and just regular one on one messaging. The messages don't go through at all or you have to power off to receive them. Then last night on a group text between myself and one other iphone user and a droid user messages were not all going through and an "unknown" appeared on the droid users screen as if this person tried to send a message on our group text but nothing was there. The iphone users could not see this. This morning - messages still not going through on group text or one on one. Any ideas?

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SMS texts are a carrier function

Check for a carrier update

If the droid user used an iPhone previously have them de register their number

Also check with carrier tech support

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