Why Choose Keith Thomas
• 20 years of experience as a Senior Apple Support Specialist at Apple Computer UK HQ.
• Former Apple Computer UK Mac Support Specialist and Apple Authorised Service Provider background.
• Established and Independent since 2010 for on‑site Apple Support Service – no call centres, no outsourcing, no hardware repairs. Over 25,000+ Apple problems resolved. Unique on-site Apple Support Service. backed up with Independent Apple Telephone Support Assistance.
• Trusted by home users, small businesses, and professionals across London and the South East UK.• Clear, honest, software‑only support. No Hardware Repairs. Expert Apple Consultancy Service.
On‑site iPhone and Mobile Network Support in London and the South East UK
What this page covers
This guide explains the most common reasons why an iPhone cannot send text messages (SMS), the steps you can try yourself, and when it’s time to get professional on‑site help. It applies to:
• iPhone 17 / 17 Pro / 17 Pro Max / iPhone Air
• iPhone 16 / 16 Pro / 16 Pro Max
• iPhone 15 / 15 Pro
• iPhone 14 / 14 Pro
• iPhone 13 / 13 Pro
• iPhone 12 / 12 Pro
• iPhone SE (2nd and 3rd generation)
And all UK mobile networks including EE, O2, Vodafone, Three, Sky Mobile, BT Mobile, Virgin Media O2 and Tesco Mobile.
The most common SMS sending problems
These are the issues Keith Thomas sees most often during on‑site visits:
• iPhone not sending text messages (SMS)
• iPhone says “Not Delivered”
• iPhone cannot send SMS to Android phones
• iPhone only sending iMessages, not SMS
• iPhone not sending SMS on EE / O2 / Vodafone / Three
• iPhone not sending SMS after switching networks
• iPhone not sending SMS after update
• iPhone not sending SMS when abroad
Quick checks you can do yourself
These steps solve around 50% of SMS issues.
Check 1 – Restart the iPhone
Check 2 – Turn Airplane Mode off and on
Check 3 – Check mobile signal strength
Check 4 – Turn off Wi‑Fi Calling temporarily
Check 5 – Make sure “Send as SMS” is enabled
iPhone not sending text messages (SMS)
This usually means:
• Network issue with your mobile provider
• SMS service not active on your plan
• Temporary network congestion
Try:
• Restarting the iPhone
• Turning Airplane Mode off and on
• Sending a test SMS to yourself
iPhone says “Not Delivered”
This usually means:
• Weak or unstable mobile signal
• SMS centre number issue
• Network routing problem
Try:
• Resending the message
• Restarting the iPhone
• Turning Wi‑Fi Calling off temporarily
iPhone cannot send SMS to Android phones
This usually means:
• iMessage trying to send instead of SMS
• Number still registered to iMessage on another device
• SMS fallback disabled
Try:
• Settings → Messages → Turn off iMessage temporarily
• Make sure “Send as SMS” is enabled
• Restarting the iPhone
iPhone only sending iMessages, not SMS
This usually means:
• SMS disabled in settings
• No mobile signal for SMS
• Network issue preventing SMS fallback
Try:
• Turning off iMessage temporarily
• Checking mobile signal
• Restarting the iPhone
iPhone not sending SMS after switching networks
This usually means:
• SMS service not activated yet
• Porting delay (PAC code transfer)
• SMS centre number incorrect
Try:
• Restarting the iPhone
• Turning Airplane Mode off and on
• Contacting your mobile provider
iPhone not sending SMS when abroad
This usually means:
• Roaming disabled
• Network not supporting SMS roaming
• Temporary roaming network issue
Try:
• Turning on Data Roaming
• Restarting the iPhone
• Selecting a different network manually
When DIY stops working
You should get on‑site help if:
• SMS will not send at all
• SMS only fails to certain numbers
• SMS stopped working after an update
• SMS works on another phone but not your iPhone
These issues usually require:
• iPhone messaging configuration repair
• Network and SMS routing diagnostics
• Mobile provider checks
• Apple Account and iCloud messaging checks
On‑Site iPhone Support – London & South East UK
If your iPhone is not sending text messages (SMS), Keith Thomas provides an often same‑day on‑site support service across:
• Central London
• West, North, South and East London
• Surrey
• Berkshire
• Hampshire
• Wiltshire
Keith Thomas is an Apple Support Specialist in:
• iPhone SMS and messaging issues
• Apple Account and iCloud messaging problems
• Mobile network troubleshooting
• iPhone configuration and repair
Book on‑site help in London and the South East UK
If your iPhone is not sending text messages, Keith Thomas can visit your home or office and get everything working again.
Keith Thomas – Apple Support Specialist
Established 2010 – Open 09:30–20:30, 7 Days
Contact Keith Thomas by Telephone: 07800 940756 or by Text to: 07800 940756, or simply complete an online website contact form 24/7