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Did you buy the Doro second hand? If you bought it brand new take it back to where you bought it and they should be able to sort it out for you, often free of charge.
If you bought it second hand you'll find most mobile phones are 'Locked' to a specific network so you have to buy one of their sim cards. A sim card from another network will not be recognised by the handset and it will give you the "Invalid" message you're getting.
Try this. Turn off the phone, remove the sim card and turn the handset back on without the sim in it. Don't worry this won't damage the phone. There should be a logo or name on the screen showing who the registered network is. If the network is different to the sim card you have the phone won't make calls or send texts.
There is a reasonably easy, (and often cheap), fix for this. Take the hand set to a good phone repair shop and for a small fee they should be able to 'Unlock' the handset to where it will accept any network's sim cards.
maybe you bought the wrong battery model for your cellphone.. you should make sure that the old model is exactly the same with the new battery that you bought.
Is it a new handset? If so it will be locked into the network it was intended for, and if you are trying to use your old sim from another network/operator in this new phone, it will not work until you get the phone unlocked.
If you are saying the sim that came with the phone is saying "invalid", then you need to speak to the mobile provider about this.
If you have used the phone successfuly before & this has just started happenning, the only thing I can suggest is to take out the card, make sure the metal contacts on the card & inside the phone are clean, replace it & try again. If still no joy you may have been disconnected by your network.
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