The settings of your HTC Wildfire will not change when you remove the SIM card, but you may lose your contacts.
depending on what service you have. but most likely not
No... the funds credited to your phone's account is still valid - you simply order a new SIM card (with the same number).
To change the sim card on your iPhone simply open it at the back remove the battery and replace your sim card.
If you take the sim card out of HTC wildfire you will lose all your information. The sim card is what holds all your phone numbers, services details and messages.
yes
Get a new sim card.
It sounds like your phone is locked to a specific network (not the network for your SIM card). You might need to get it unlocked before you can use the SIM you have.
Some mobile phones use SIM cards, other don't. The phones with SIM card slot allow the user to change the SIM; this way you can change the telephone number, or you can log to different networks (providers). SIM cards have not any alternative solutions.
You put a sim card in it.
It shouldn't harm your smart phone to remove and replace the battery. If you have to remove the battery to change the sim card, it is to be expected.
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