I'm having a problem with the samsung galaxy s, on vodafone. today suddenly, the fone stopped making and receiving calls and texts. when i put my sim in another fone, it works fine. when i put other sims (virgin, lebara and another vodafone) into my samsung, its fine too. its just the two together don't work. although i say it doesnt work, there are periods when it does but this generally last a minute or two, then there is no network connection after. Does anyone have any idea what might be up with it? Also if i factory restore it, will it cause my phone to become locked again (i bought it unlocked from ebay, unlocked by the seller). Thanks so much!

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can you receive calls and texts even whilst nothing is being displayed e.g. will it start ringing in your hand but unable to answer?

Message centre is a number that the phone uses to send and receive SMS (text) messages and similar.
Call your network provider (eg: Vodafone) and ask them what your message centre number is.

check this out
https://xtrium.com/vodafone-wifi-calling/

U can try a cold reboot that where u have the fone turn on
and then u take out the battary while the
fone is turn on it fixed many erorr.

call or bring it to the store where you buy your service provider to reactivate your plan.

Means no service mate Problem is with provider or you have no coveridge in your area from that provider or you got a dud sim card

turn the answer function off...................???