Why won't my iPhone 4 send text messages?

I have an iPhone 4. About a month ago, I removed its SIM. I put the SIM back a few days ago and now I can't send text messages. All the other features of the phone are working. Do you think something is wrong with the SIM or is the phone at fault? I was able to send text messages before.

http://support.apple.com/kb/TS2755

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From my original reply, "Why did you change your SIM card?" Did you change carriers, was there a problem with the original SIM, did you change plans?
The iPhone has no settings for SMS. SMS is a carrier feature, call them back and have them check the provisioning on your account. If this SIM change caused the problem, it has nothing to do with the phone.

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Why don't you call your carrier or your friend's carrier. SMS is sent via cellular data.

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Hi! I know this is much later but if anyone else has this problem I think I've found the solution, the problem is the obvious SIM Card, you may need to activate your sim card on your carriers website! I am with Orange EE and that's the verdict for me! Hope this helps P.S. I've had the same problem x

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And when I tap it it was tap try again and I press it over an over and it never works and. I'm starting to get really mad its been like this for two
Days please help !!!

SMS and MMS messaging requires an appropriate plan from your carrier for use on iPhone.
For more information on how to use SMS and MMS messaging on iPhone, see the iPhone User Guide.
From Here > About Messages
Troubleshooting Messages
http://support.apple.com/kb/TS2755

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Check Settings>Messages, turn Send As SMS to On. If it's already on you may want to check with your carrier to be sure that your messaging plan is properly provisioned.

Help! iPhone won't let me send text messages

Help my iPhone won't let me send messages but everything works.

Hi! I know this is much later but if anyone else has this problem I think I've found the solution, the problem is the obvious SIM Card, you may need to activate your sim card on your carriers website! I am with Orange EE and that's the verdict for me! Hope this helps P.S. I've had the same problem x

My iphone send Text message to apple 30cent

Hallo this is a hot topic on many forums in Italy about that all iphones are sending a text message to this number in UK 00447860015 **** no one have an answer to this threat and what it seems if for sure that all italian company are not involve since I call my company and they said is an Iphone ios8 issue.
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FaceTime and iMessage, as I said, send SMS messages to Apple's server in the UK to activate and re-activate the service. Every iPhone in the world does the same thing. That's about a half a billion phones. Apple has an agreement with partner carriers to not charge for the reactivation messages. It would seem that TIM is not honoring that agreement. It has nothing to do with the iPhone or the version of iOS. Most carriers do honor it. As TIM is a supported carrier they should honor the agreement also. If they do not you have to confront TIM about why they are charging you for a service that they have agreed to provide for free under their contract with Apple. Either that, or TIM does not know that you are using an iPhone with their service.

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To fix your problem I would suggest deleting then re-adding the account. The steps to do this are listed below:
Menu
Settings
Accounts
Click on the Account
Then Remove account
Once you have removed the account, follow the steps listed below:
Go to Menu
Settings
Accounts
Menu
Add Account
Choose what kind of account and enter your information

Why won't Verizon iPhone send iMessage when on call and Wifi?

I am new to Verizon and am aware of the simultaneous voice and data limitation, however I was under the impression that wifi would work normally while on a phone call, and it does.
However I am finding that when on a phone call, and successfully on wifi, iMessages do not get sent. They fail.
Anyone else get this? Can you please test it?
I have a iphoen 5 on 6.0.1 already BTW but have no idea if it happened before with 6.0.
Brian

He is correct. All data is in one giant pool once you are on Wifi. The prioritization is first come first serve, unless the phone is implementing some sort of QoS at the packet level, which is very unlikely. This is the same way a full computer works, everyone sends their data broken up into small packets (Each packet is ~1k in size at maximum.) All of those packets just go into a queue in the order they were sent, and the modem handles sending them out.
The question is if iMessage is really going over the standard data routing, or if they are still using some sort of SMS wrapper. If its just data, it shoud send/recieve without issue regardless of what other data applications are running.

HT3529 why is it that when sending texts, sometimes it shows in blue and other times in green ? What does that mean?

Why is it that when sending text messages, sometimes they go through in blue and sometimes in green? What does that mean ?
My second question is, at times after sending a text it says: Sent as a text message.....I'm thinking, really? that's what I thought I sent in the first place !
Some one please help me out.......

Hi JoFan0465,
Welcome to the Support Communities!
Good question!
Blue messages are iMessage conversations (Apple's messaging service)
Green messages are SMS - standard text messages.
SMS is the acronym for Short Message Service.
MMS is the acronym for Multimedia Message Service (audio, pictures, video can be added to messages).
With MMS turned on, you will see a little camera icon in the bottom left corner of your screen when you are in the Messages app. Also you will see the word iMessage where you type your text.
The link below will explain more:
Apple - iOS 6 - Messages with iMessage, for unlimited texting.
See the iPhone User Guide - pgs. 64-66 to learn more about Messages:
manuals.info.apple.com/en_US/iphone_user_guide.pdf
The article that you referenced, iOS: Using Messages explains all of the parameters and requirements for sending messages on your iPhone.
I hope this information helps ....
Have a great day!
- Judy
<Edited By Host>

HT4436 Why is my daughter receiving my text messages on her itouch when I send them from my iphone? We are both on icloud so how can I separate the two? Do I need another icould or apple account??

Why is my daughter receiving my text messages on her itouch when I send them from my iphone? We are both on icloud so how can I separate the two? Do I need another icould or apple account??

It's happening because you are using the same Apple ID for iMessage. You don't need to do anything with your iCloud account to fix this. You should create a separate Apple ID for her device to use with iMessage and FaceTime. (You can continue to share the same ID for purchasing from the iTunes and App stores if you wish; it doesn't need to be the same as the ID you use for other services.) Once you've done this, on her device go to Settings>Messages>Send & Receive, tap the ID, sign out, then sign back in with the new ID. Do the same thing in Settings>FaceTime.
Another caution is that if you share and iCloud account with her, any data you both sync with the account such as contacts, will be merged and the merged data will appear on both devices. If you don't want to end up with each other's contacts, calendars, etc. on your devices, you should have separate iCloud accounts to. If you want to make this change, go to Settings>iCloud on her device and tap Delete Account. (This only deletes the account from the device, not from iCloud.) When prompted about what to do with the iCloud data be sure to choose Keep On My iPod. Then set up a new iCloud account with her new ID, turn on iCloud data syncing again, and when prompted choose Merge.

Why do text messages from my iPad appear to some people as if they came from my email address instead of my phone number? This does not happen when I send text messages from my iPhone.

Why do text messages from my iPad appear to some people as if they came from my email address instead of my phone number? This does not happen when I send text messages from my iPhone.

You need to link your iPhone number to Messages - and Facetime if you use it. For Messages go to Settings>Messages>Send and Receive at>You can be reached by iMessage at. If your phone number is showing there, select it as your Contact address. If it doesn't appear in there, take a look at the end of this article for help.
iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage - Apple Support

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Why can't I send text messages on my iPad? I can send and receive messages on my iPhone.

Hi Kathy,
Happy Holidays! Do you have an iPad with cellular service and a text-messaging plan?
Send messages with your iPhone, iPad, or iPod touch - Apple Support
http://support.apple.com/en-us/HT201287
What's the difference between SMS/MMS and iMessage?
SMS/MMS lets you send text messages and photos to other cellular phones or devices. iMessage lets you send text messages and photos to another iOS device over Wi-Fi, without worrying about text-messaging charges (cellular data charges may apply).
What do I need to use SMS/MMS and iMessage?
Here's what you need to use SMS/MMS and iMessage:
SMS/MMS: A text-messaging plan. Contact your carrier for more information.
iMessage: An iPhone, iPad, or iPod touch with iOS 5 or later.
How do I know if my message used SMS/MMS or iMessage?
You can tell which type of message you're sending by the color of the Send button and text bubble.
SMS/MMS: Send button and text bubbles are green.
iMessage: Send button and text bubbles are blue.
How can I link my iPhone number with Messages on my iPad, iPod touch, or Messages for Mac?
When you sign in to Messages with your Apple ID on your iPhone, you link your phone number to your Apple ID. If you then sign in to Messages with the same Apple ID on your iPad, iPod touch, or Mac, Messages will link that device to your phone number as well.
I hope this information helps ....
- Judy

Why won't my ipad send a simple txt message to a phone number that is not listed with imessage. It workls fine from my iphone. Same carrier.

Why won't my ipad send a simple txt message to a phone number that is not listed with imessage. It works fine from my iphone. Same carrier.

You can read why here:
about messages
http://support.apple.com/kb/HT3529
Troubleshooting messages
http://support.apple.com/kb/TS2755

Why won't my iPhone 4 send text messages?

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