My brother isn't on Plusnet but me and my mum are. We were on O2 ages ago which we ported our numbers to Plusnet however my brothers texts come through to me but not my mum.
Ah! so it could be a split port on your mum's phone. Can she receive texts from anyone else on the same network as your brother ?
To explain a little, when you port a number to a new network both the network that originally issued the number, and the new network, are involved. When a call or text is made to the ported number, it first goes to the original network which then routes it on to the new network. Porting involves exchanging of information across the losing network, the original network and the new network and is a largely manual operation involving exchanging of files. If something doesn't quite go right, then you can end up with a 'split port' where one of the networks involved hasn't got the correct information and doesn't know how to route the call or text. Note that there's separate routing for calls and texts so it sort of makes sense that calls can work whereas texts won't.
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