Why can't a certain person receive my text or calls?

I have recently moved from my mums house in with my wife in a different county.
were i'm currently living i have a bad 3G signal and my phone signal is a medium level, usally 3/5 bars.

i have a iphone 4s 16gb on tesco mobile ( which uses o2 signal )

my mother has a very basic phone which is only used for calls and text. ( t-mobile )

for some unknown reason to me we can't call each other and our text arn't going through to each others phones.
none of us have blocked each other numbers as we get on, on very good terms and love to keep in contact with each other.

They may have blocked you

My iPhone 5s won't receive a text from one person?

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