Trough it in dust bin and buy another mobile
Use iTunes to do that.
You can make the speed better on an iPhone 4 2010 model by deleting unused apps, clearing cookies, and cache and turning off unneeded notifications.
Blackberry and iPhone
Defect Propagation Model
You can check the model number on the back of the phone or in the settings menu to determine if you have an iPhone 6 or 6s. Additionally, the iPhone 6s introduced 3D Touch technology, which the iPhone 6 does not have.
Currently the iPhone has sold 250 million units. Certainly the iPhone 4 accounted for a significant portion of this number, but official sales numbers for this model are not freely available.
"iPhone" refers to iPhones in general and not a specific model. "iPhone 4" is a specific model. So, they are technically not the same thing. It's more common for people to refer to their iPhone rather than their iPhone 4 though.
The iPhone 3G has Bluetooth and so will the 3Gs model too. I do not know if the 2G model does though.
Picture messaging is available on every model of the iPhone, including the 3G. However, this feature is only available if your iPhone software is running on version 3.0 or later. You can check your software version by going to Settings > General > About...and then scrolling down to "Version". If this says you have a version older than 3.0 (such as 2.x), then you need to update. All you have to do is plug your iPhone into your computer and start iTunes. Once iTunes recognizes your phone, click your phone's name on the side bar and you should see a message informing you that a newer version of software is available. Allow iTunes to perform the update and, after your iPhone reboots, picture messaging will be available.
*#0000#- To know the model number and software version
Depends on the model