Hi,
Try a soft reset by turning your phone Off and On.
Does this his happen at home or everywhere ?
Vodafone Mast Network Checker.
Can you try your SIM card in another phone as a Process of Elimination to rule out a faulty sim or faulty phone.
Ensure you have not accidentally added any contacts to a text blocker feature if your phone has that feature. Ask the recipients have not done the same, again handset dependant.
Current Phone >
Samsung Galaxy s²⁴ Ultra 512gb.
